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{{Related articles start}}
{{Article summary start}}
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{{Related|Desktop environment}}
{{Article summary text|This article covers installation, configuration, and troubleshooting of KDE.}}
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{{Related|Display manager}}
{{Article summary heading|Overview}}
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{{Related|Dolphin}}
{{Article summary text|{{Graphical user interface overview}}}}
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{{Related|Window manager}}
{{Article summary heading|Related}}
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{{Related|Qt}}
{{Article summary wiki|Plasma}}
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{{Related|KDevelop}}
{{Article summary wiki|Qt}} - KDE uses the Qt toolkit
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{{Related|Trinity}}
{{Article summary wiki|KDM}}
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{{Related|Uniform Look for Qt and GTK Applications}}
{{Article summary wiki|KDevelop 4}}
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{{Related articles end}}
{{Article summary wiki|Uniform Look for Qt and GTK Applications}}
 
{{Article summary end}}
 
  
From [http://www.kde.org/community/whatiskde/softwarecompilation.php KDE Software Compilation] and [http://www.kde.org/download/ Getting KDE Software]:
+
KDE is a software project currently comprising of a [[desktop environment]] known as Plasma, a collection of libraries and frameworks (KDE Frameworks) and several applications (KDE Applications) as well. KDE upstream has a well maintained [https://userbase.kde.org/ UserBase wiki]. Detailed information about most KDE applications can be found there.
 
 
:''The KDE Software Compilation is the set of frameworks, workspaces, and applications produced by KDE to create a beautiful, functional and free desktop computing environment for Linux and similar operating systems. It consists of a large number of individual applications and a desktop workspace as a shell to run these applications. ''
 
 
 
The KDE upstream has a well maintained [http://userbase.kde.org/ UserBase wiki]. Users can get detailed information about most KDE applications there.
 
  
 
== Installation ==
 
== Installation ==
  
KDE 4.x is '''modular'''. You can install an entire set of packages or only install your preferred KDE applications.
+
=== Plasma ===
  
{{Note|If you do not have [[Xorg#Installation|Xorg]] installed on your system, be sure to install it before KDE.}}
+
Before installing Plasma, make sure you have a working [[Xorg]] installation on your system.
  
=== Full install ===
+
[[Install]] the {{Pkg|plasma-meta}} meta-package or the {{Grp|plasma}} group. For differences between {{Pkg|plasma-meta}} and {{Grp|plasma}} reference [[Creating packages#Meta packages and groups]]. Alternatively, for a more minimal Plasma installation, install the {{Pkg|plasma-desktop}} package.
  
[[pacman|Install]] {{Grp|kde}} or {{Grp|kde-meta}} available in the [[official repositories]]. For differences between {{Grp|kde}} and {{Grp|kde-meta}} see the [[KDE Packages]] article.
+
To enable support for [[Wayland]] in Plasma, also install the {{Pkg|plasma-wayland-session}} package.
  
=== Minimal install ===
+
=== KDE applications ===
  
If you want to have a minimal installation of the KDE SC, install:
+
To install the full set of KDE Applications, install the {{Grp|kde-applications}} group or the {{Pkg|kde-applications-meta}} meta-package. Note that this will only install applications, it will not install any version of Plasma.
* {{Grp|kdebase}}
 
* {{Pkg|phonon-vlc}} or {{Pkg|phonon-gstreamer}} as phonon backend
 
  
=== Language pack ===
+
=== Unstable releases ===
  
If you need language files, install {{ic|kde-l10n-yourlanguagehere}} (e.g. {{Pkg|kde-l10n-de}} for the German language).
+
See [[Official repositories#kde-unstable]]
  
For a full list of available languages see [https://www.archlinux.org/packages/extra/any/kde-l10n/ this link].
+
== Starting Plasma ==
 +
{{Note|Although it is possible to launch Plasma under [[Wayland]], there are some missing features and known problems as of Plasma 5.11. See the [https://community.kde.org/Plasma/5.11_Errata#Wayland Plasma 5.11 Errata] for a list of issues and the [https://phabricator.kde.org/project/board/99/ Plasma on Wayland workboard] for the current state of development. Use [[Xorg]] for the most complete and stable experience.}}
  
== Upgrading ==
+
Plasma can be started either using a [[display manager]], or from the console.
  
'''KDE 4.11''' Software Compilation is the current major [http://kde.org/announcements/ release of KDE]. Important hints for upgraders:
+
=== Using a display manager ===
* Always check if your mirror is '''up to date'''.
 
* '''Do not force an update using pacman --force'''. If pacman complains about conflicts please '''file a bug report'''.
 
* You can remove the meta packages and the sub packages you do not need after the update.
 
* If you do not like split packages just keep using the kde-meta packages.
 
  
== Starting KDE ==
+
* Select ''Plasma'' to launch a new session in [[Xorg]].
 +
* [[Install]] {{Pkg|plasma-wayland-session}} and select ''Plasma (Wayland)'' to launch a new session in [[Wayland]].
  
Starting KDE depends on your preferences. Basically there are two ways of starting KDE. Using '''KDM''' or '''xinitrc'''.
+
{{Note|The [[NVIDIA]] proprietary driver implementation for Wayland requires EGLStreams. KDE have not implemented EGLStreams in their Wayland [https://blog.martin-graesslin.com/blog/2016/09/to-eglstream-or-not implementation]. The following workarounds are available:
 
+
*Using the [[Nouveau]] driver.
=== Using KDM (KDE Display Manager)===
+
*Using the (default) Xorg session.
 
+
}}
''It is highly recommended to get familiar with the [[Display Manager|full article]] concerning display managers, before you make any changes. See also [[KDM]] Wiki page.''
 
 
 
[[Daemons|Enable/start]] {{ic|kdm.service}}.
 
  
=== Using xinitrc ===
+
=== From the console ===
''The meaning and usage of '''xinitrc''' is very well described [[Xinitrc|here]].
 
  
{{Pkg|kdebase-workspace}} provides startkde. Make sure it is installed. Then edit {{ic|~/.xinitrc}}, uncomment:
+
To start Plasma with [[xinit]]/''startx'', append {{ic|exec startkde}} to your {{ic|.xinitrc}} file. If you want to start Xorg at login, please see [[Start X at login]]. To start a Plasma on Wayland session from a console, run {{ic|startplasmacompositor}}.
exec startkde
 
 
 
After a reboot and/or log-in, each execution of Xorg ('''startx''' or '''xinit''') will start KDE automatically.
 
 
 
{{Note|If you want to start Xorg at boot, please read [[Start X at Login]] article.}}
 
  
 
== Configuration ==
 
== Configuration ==
  
All KDE configuration is saved in the {{ic|~/.kde4}} folder. If your KDE is giving you a lot of trouble or if you ever want a fresh installation of KDE, just back this folder up and restart your X session. KDE will re-create this folder with all the default config files. If you want very fine-grained control over your KDE programs, then you may want to edit the files in this folder.
+
Most settings for KDE applications are stored in {{ic|~/.config}}. However, configuring KDE is primarily done through the '''System Settings''' application. It can be started from a terminal by executing {{ic|systemsettings5}}.
 
 
However, configuring KDE is primarily done in ''''System Settings''''. There are also a few other options available for the desktop with ''''Default Desktop Settings'''' when you right click the desktop.
 
 
 
For other personalization options not covered below such as activities, different wallpapers on one cube, etc please refer to the [[Plasma]] wiki page.
 
  
 
=== Personalization ===
 
=== Personalization ===
 
How to set up the KDE desktop to your personal style; use different Plasma themes, window decorations and icon themes.
 
  
 
==== Plasma desktop ====
 
==== Plasma desktop ====
 
[[Plasma]] is a desktop integration technology that provides many functions from displaying the wallpaper, adding widgets to the desktop, and handling the panels or "taskbar".
 
  
 
===== Themes =====
 
===== Themes =====
  
[http://kde-look.org/index.php?xcontentmode=76 Plasma themes] can be installed through the Desktop Settings control panel. Plasma themes define how your panels and plasmoids look like. If you like to have them installed system-wide, themes can be found in both the official repositories and [https://aur.archlinux.org/packages.php?O=0&K=plasmatheme&do_Search=Go AUR].
+
[https://store.kde.org/browse/cat/104/ Plasma themes] define the look of panels and plasmoids. For easy system-wide installation, some themes are available in both the official repositories and the [https://aur.archlinux.org/packages.php?O=0&K=plasmatheme&do_Search=Go AUR].
  
===== Widgets =====
+
The easiest way to install themes is by going through the ''System Settings > Workspace Theme > Desktop Theme > Get new Themes''.
  
Plasmoids are little scripted or coded KDE apps that enhance the functionality of your desktop.  There are two kinds, plasmoid scripts and plasmoid binaries.
+
This will present a frontend for the [https://store.kde.org/ KDE-Store] that allows you to install, uninstall, or update third-party plasmoid scripts.
  
Plasmoid binaries must be installed using PKGBUILDS from [https://aur.archlinux.org/packages.php?O=0&K=plasmoid&do_Search=Go&PP=25&SO=d&SB=v AUR].  Or write your own PKGBUILD.
+
Splash and Lock screens are currently unavailable. To customize these screens, you have to modify the original theme found in {{ic|/usr/share/plasma/look-and-feel/}}.
 +
See [https://www.kubuntuforums.net/showthread.php?67599-Plasma-5-background-images&s=59832dc20e5bfc2948dbb591d8453f61 this thread] on the Kubuntu forums.
  
The easiest way to install plasmoid scripts is by right-clicking onto a panel or the desktop:
+
Note that the [[SDDM]] login screen is not part of this theme.
  
Add Widgets > Get new Widgets > Download Widgets
+
====== Qt and GTK+ Applications Appearance ======
  
This will present a nice frontend for [http://www.kde-look.org/ kde-look.org] and allows you to (un)install or update third-party plasmoid scripts with just one click.
+
{{Tip|For Qt and GTK theme consistency, see [[Uniform look for Qt and GTK applications]].}}
  
Most plasmoids are not created officially by KDE developers.  You can also try installing Mac OS X widgets, Microsoft Windows Vista/7 widgets, Google Widgets, and even SuperKaramba widgets.
+
; Qt4
  
===== Sound applet in the system tray =====
+
For Qt4 applications to have a consistent appearance, there are two options:
  
Install Kmix ({{Pkg|kdemultimedia-kmix}}) from the official repositories and start it from the application launcher. Since KDE autostarts programs from the previous session, the program need not be started manually every time one logs in.
+
Install {{Pkg|breeze-kde4}} and then pick Breeze as GUI Style in {{ic|qtconfig-qt4}}; or install {{Pkg|breeze-gtk}} and pick GTK+ as GUI Style.
  
==== Window decorations ====
+
; GTK+
  
[http://kde-look.org/index.php?xcontentmode=75 Window decorations] can be changed in
+
The recommended theme for a pleasant appearance in GTK+ applications is {{Pkg|breeze-gtk}} or {{AUR|gnome-breeze-git}}, a GTK+ theme designed to mimic the appearance of Plasma's Breeze theme.
System Settings > Workspace Appearance > Window Decorations
+
Install {{Pkg|kde-gtk-config}} and select the installed GTK-theme for GTK2/GTK3-Theme in ''System Settings > Application Style > GNOME Application Style''.
There you can also directly download and install more themes with one click and some are available on [https://aur.archlinux.org/packages.php?O=0&K=kdestyle&do_Search=Go&PP=25&SO=d&SB=v AUR].
 
  
==== Icon themes ====
+
In some themes, tooltips in GTK+ applications have white text on white backgrounds making it difficult to read. To change the colors in GTK2 applications, find the section for tooltips in the {{ic|.gtkrc-2.0}} file and change it. For GTK3 application two files need to be changed, {{ic|gtk.css}} and {{ic|settings.ini}}.
 +
It might also help to uncheck the option to ''Apply colors to non-Qt applications'' under ''System Settings'' > ''Colors''.
  
Not many full system icons themes are available for KDE 4.  You can open up '''System Settings > Application Appearance > Icons''' and browse for new ones or install them manually. Many of them can be found on [http://www.kde-look.org/ kde-look.org].
+
Some GTK2 programs like {{AUR|vuescan-bin}} still look hardly usable due to invisible checkboxes with the Breeze or Adwaita skin in a Plasma session. To workaround this, install and select e.g. the Numix-Frost-Light skin of the {{AUR|numix-frost-themes}} under ''System Settings'' > ''Application Style'' > ''GNOME Application Style (GTK)'' > ''Select a GTK2 Theme:''. Numix-Frost-Light looks similar to Breeze.
  
Official logos, icons, CD labels and other artwork for Arch Linux are provided in the {{Pkg|archlinux-artwork}} package.  After installing you can find such artwork at {{ic|/usr/share/archlinux/}}.
+
===== Widgets =====
  
==== Fonts ====
+
Plasmoids are little scripted (plasmoid scripts) or coded (plasmoid binaries) KDE applications designed to enhance the functionality of your desktop.
  
===== Fonts in KDE look poor =====
+
The easiest way to install plasmoid scripts is by right-clicking onto a panel or the desktop and choosing ''Add Widgets > Get new Widgets > Download Widgets''.
Try installing the {{Pkg|ttf-dejavu}} and {{Pkg|ttf-liberation}} packages.  
+
This will present a nice frontend for https://store.kde.org/ that allows you to install, uninstall, or update third-party plasmoid scripts with literally just one click.
  
After the installation, be sure to log out and back in. You should not have to modify any settings in the "Fonts" panel of the KDE System Settings application.
+
Many Plasmoid binaries are available from the [https://aur.archlinux.org/packages.php?O=0&K=plasmoid&PP=50&SO=d&SB=v AUR].
  
If you have personally set up how your [[Fonts]] render, be aware that System Settings may alter their appearance.  When you go ''System Settings > Appearance > Fonts'', System Settings will likely alter your font configuration file ({{ic|fonts.conf}}).
+
===== Sound applet in the system tray =====
  
There is no way to prevent this but if you set the values to match your {{ic|fonts.conf}} file the expected font rendering will return (it will require you to restart your application or in a few cases for you to have to restart your desktop).  
+
[[Install]] {{Pkg|plasma-pa}} or {{Pkg|kmix}} (start Kmix from the Application Launcher). {{Pkg|plasma-pa}} is now installed by default with {{Grp|plasma}}, no further configuration needed.
  
Note too that Gnomes' Font Preferences will also do this if you use both desktop environments.
+
{{Note|1=To adjust the [https://bugs.kde.org/show_bug.cgi?id=313579#c28 step size of volume increments/decrements], add e.g. {{ic|1=VolumePercentageStep=1}} in the {{ic|[Global]}} section of {{ic|~/.config/kmixrc}}.}}
  
===== Fonts are huge or seems disproportional =====
+
===== Disable panel shadow =====
  
Try to force fonts DPI to '''96''' on ''System Settings > Application Appearance > Fonts.''
+
As the Plasma panel is on top of other windows, its shadow is drawn over them. [https://bbs.archlinux.org/viewtopic.php?pid=1228394#p1228394] To disable this behaviour without impacting other shadows, [[install]] {{Pkg|xorg-xprop}} and run:
  
If it does not work try set DPI directly on Xorg configuration [[Xorg#Setting_DPI_manually|here]].
+
$ xprop -remove _KDE_NET_WM_SHADOW
  
==== Space efficiency ====
+
then select the panel with the plus-sized cursor. [https://forum.kde.org/viewtopic.php?f=285&t=121592] For automation, install {{Pkg|xorg-xwininfo}} and create the following script:
  
Users with small screens (eg Netbooks) can change some setting to make KDE more space efficient. See [http://userbase.kde.org/KWin#Using_with_small_screens_(eg_Netbooks) upstream wiki] for more info. Also you can use [http://www.kde.org/workspaces/plasmanetbook/ KDE's Plasma Netbook] which is a workspace made specifically for small, lightweight netbook devices.
+
{{hc|/usr/local/bin/kde-no-shadow|<nowiki>
 +
#!/bin/bash
 +
for WID in $(xwininfo -root -tree | sed '/"Plasma": ("plasmashell" "plasmashell")/!d; s/^  *\([^ ]*\) .*/\1/g'); do
 +
  xprop -id $WID -remove _KDE_NET_WM_SHADOW
 +
done
 +
</nowiki>}}
  
=== Networking ===
+
Set execution permissions for the script:
  
You can choose from the following tools:
+
  # chmod 755 /usr/local/bin/kde-no-shadow
* NetworkManager. See [[NetworkManager#KDE4|NetworkManager]] for more information.
 
* Wicd and its KDE front end {{AUR|wicd-kde}}. See [[Wicd]] for more information.
 
  
=== Printing ===
+
The script can be run on login with ''Add Script'' in ''Autostart'':
  
{{Tip|Use the [[CUPS]] web interface for faster configuration.}}
+
$ kcmshell5 autostart
  
The printers are configured in this way can be found in applications KDE.
+
==== Window decorations ====
  
You can also choose the printer configuration through ''System Settings > Printer Configuration''. To use this method, you must first install the packages {{Pkg|kdeutils-print-manager}} and {{Pkg|cups}}.
+
[https://store.kde.org/browse/cat/114/ Window decorations] can be changed in ''System Settings > Application Style > Window Decorations''.
  
You need to start the avahi-daemon and cupsd daemons first or you will get the following error:  
+
There you can also directly download and install more themes with one click, and some are available in the [https://aur.archlinux.org/packages.php?O=0&K=kdestyle&do_Search=Go&PP=25&SO=d&SB=v AUR].
{{bc|The service 'Printer Configuration' does not provide an interface 'KCModule'
 
with keyword 'system-config- printer-kde/system-config-printer-kde.py'
 
The factory does not support creating components of the specified type.
 
}}
 
  
If you are getting the following error, you need to give the user rights to manage printers:
+
==== Icon themes ====
There was an error during CUPS operation: 'cups-authorization-canceled'
 
  
For CUPS, this is set in {{ic|/etc/cups/cupsd.conf}}.
+
Icon themes can be installed and changed on ''System Settings > Icons''.
  
Adding {{ic|lp}} to {{ic|SystemGroup}} allows anyone who can print to configure printers. You can, of course, add another group instead of {{ic|lp}}.
+
{{Note|Although all modern Linux desktops share the same icon theme format, desktops like [[GNOME]] use fewer icons (esp. in menus and toolbars). Themes developed for such desktops usually lack icons required by Plasma and KDE apps. It is recommended to install Plasma compatible icon themes instead.}}
{{hc|/etc/cups/cupsd.conf|# Administrator user group...
 
SystemGroup sys root lp}}
 
  
=== Samba/Windows support ===
+
==== Fonts ====
  
If you want to have access to Windows services install [[Samba]] (package {{Pkg|samba}}).
+
===== Fonts in a Plasma session look poor =====
  
You may then configure your Samba shares through
+
Try installing the {{Pkg|ttf-dejavu}} and {{Pkg|ttf-liberation}} packages.
  
  System Settings > Sharing > Samba
+
After the installation, be sure to log out and back in. You should not have to modify anything in ''System Settings > Fonts''. If you are using {{Pkg|qt5ct}}, the settings in Qt5 Configuration Tool may override the font settings in System Settings.
  
=== KDE Desktop activities ===
+
If you have personally set up how your [[Fonts]] render, be aware that System Settings may alter their appearance. When you go ''System Settings > Fonts'' System Settings will likely alter your font configuration file ({{ic|fonts.conf}}).
  
KDE Desktop Activities are Plasma based "virtual desktop"-like set of Plasma Widgets where you can independently configure widgets as if you had more than one screens/desktops.  
+
There is no way to prevent this, but, if you set the values to match your {{ic|fonts.conf}} file, the expected font rendering will return (it will require you to restart your application or in a few cases restart your desktop). Note that Gnome's Font Preferences also does this.
  
On your desktop, click the Cashew Plasmoid and on the pop-up window press "Activities".
+
===== Fonts are huge or seem disproportional =====
  
A plasma bar will appear at the bottom of the screen which presents you the current Plasma Desktop Activities which exist. You can then navigate between them by pressing their correspondent icon.
+
Try to force font DPI to {{ic|'''96'''}} in ''System Settings > Fonts''.
  
=== Power saving ===
+
If that does not work, try setting the DPI directly in your Xorg configuration as documented in [[Xorg#Setting DPI manually]].
  
KDE has an integrated power saving service called "'''Powerdevil Power Management'''" that may adjust the power saving profile of the system and/or the brightness of the screen (if supported).
+
==== Space efficiency ====
  
Since KDE 4.6, CPU frequency scaling is no longer managed by KDE.  Instead it is assumed to be handled automatically by the the hardware and/or kernel. Arch uses {{ic|ondemand}} as default CPU Frequency governor from kernel vesion 3.3. So nothing need to be done for most cases. For detaild fine tune of the governor, please see [[CPU Frequency Scaling]].
+
The Plasma Netbook shell has been dropped from Plasma 5, see the following [https://forum.kde.org/viewtopic.php?f=289&t=126631&p=335947&hilit=plasma+netbook#p335899 KDE forum post]
 +
However, you can achieve something similar by editing the file {{ic|~/.config/kwinrc}} adding
 +
{{ic|1=BorderlessMaximizedWindows=true}} in the {{ic|[Windows]}} section.
  
=== Monitoring changes on local files and directories ===
+
==== Thumbnail generation ====
 +
To allow thumbnail generation for media or document files on the desktop and in Dolphin, install {{Pkg|kdegraphics-thumbnailers}}, {{Pkg|ffmpegthumbs}} and {{AUR|kde-thumbnailer-odf}}.
  
KDE now uses '''inotify''' directly from the kernel with '''kdirwatch''' (included in kdelibs), so Gamin or FAM are no longer needed. You may want to install this {{AUR|kdirwatch}} from AUR which is a GUI frontend for kdirwatch.
+
Then enable the thumbnail categories for the desktop via ''right click'' on the ''desktop background'' > ''Configure Desktop'' > ''Icons'' > ''More Preview Options...''.
  
== System administration ==
+
In ''Dolphin'', navigate to ''Control'' > ''General'' > ''Previews''.
  
=== Set keyboard ===
+
=== Printing ===
  
In order to do that, navigate to
+
{{Tip|Use the [[CUPS]] web interface for faster configuration. Printers configured in this way can be used in KDE applications. }}
    System Settings > Hardware > Input Devices > Keyboard
 
There you may choose your keyboard model at first.
 
  
In the "'''Layouts'''" tab, you choose the languages you may want to use by pressing the "Add Layout" button and therefore the variant and the language.
+
You can also configure printers in ''System Settings > Printers''. To use this method, you must first install {{Pkg|print-manager}} and {{Pkg|cups}}. See [[CUPS#Configuration]].
  
In the "'''Advanced'''" tab, you can choose the keyboard combination you want in order to change the layouts in the "Key(s) to change layout" sub-menu.
+
=== Samba/Windows support ===
  
=== Terminate Xorg-server through KDE system settings ===
+
If you want to have access to Windows services, install [[Samba]] (package {{Pkg|samba}}).
  
Navigate to:
+
The Dolphin share functionality requires the package {{Pkg|kdenetwork-filesharing}} and usershares, which the stock {{ic|smb.conf}} does not have enabled. Instructions to add them are in [[Samba#Creating usershare path]], after which sharing in Dolphin should work out of the box after restarting Samba.
System Settings > Input Devices > Keyboard > Advanced (tab) > "Key Sequence to kill the X server" submenu
 
and tick the checkbox.
 
  
=== Useful KCM ===
+
Plasma's abilities to access SMB shares are limited, though. Writing to Windows shares is problematic and opening files from such shares, e.g. large videos, makes Plasma copying the whole file to the local system first.
 +
To workaround this, you can install a GTK based file browser like {{Pkg|thunar}} with {{Pkg|gvfs}} and {{Pkg|gvfs-smb}} (and {{Pkg|gnome-keyring}} for saving login credentials) to access SMB shares in a more able way.
 +
Another possible workaround is to [[mount]] a Samba share via {{Pkg|cifs-utils}} to make it look to Plasma like if the SMB share was just a normal local folder and thus can be accessed normally.
 +
The mount command could look like the following for write access to a public share:
 +
# mount -t cifs -o username=*,password=*,uid=1000,gid=1000,file_mode=0660,dir_mode=0770 //networkhost/share/ /home/user/localmountpoint/
 +
Make it permanent:
 +
{{hc|/etc/fstab|<nowiki>
 +
//networkhost/share/ /home/user/localmountpoint/ cifs defaults,username=*,password=*,uid=1000,gid=1000,file_mode=0660,dir_mode=0770 0 2
 +
</nowiki>}}
 +
It might be necessary to append {{ic|.local}} to the hostname. For some NAS devices it might also be necessary to append {{ic|1=vers=1.0}} to the argument line to enforce SMB 1.0 compatibility.
  
KCM means KConfig Module. This modules help you to configure you system providing a interface on System Settings.
+
An easier solution is to use {{AUR|samba-mounter-git}}, which offers basically the same functionality via an easy to use option located at ''System Settings'' > ''Network Drivers''.
  
'''Configuration for look&feel of your GTK apps.'''
+
=== KDE Desktop activities ===
* {{Pkg|kde-gtk-config}}
 
* {{AUR|kcm-gtk}}
 
* {{AUR|kcm-qt-graphicssystem}}
 
  
'''Configuration for the GRUB2 bootloader.'''
+
[https://userbase.kde.org/Plasma#Activities KDE Desktop Activities] are special workspaces where you can select specific settings for each activity that apply only when you are using said activity.
* {{AUR|grub2-editor}}
 
* {{AUR|kcm-grub2}}
 
  
'''Configuration for Synaptics driver based touchpads.'''
+
=== Power saving ===
* {{Pkg|synaptiks}}
 
* {{AUR|kcm_touchpad}}
 
  
'''Configuration for [[Firewalls#ufw|UFW]]'''
+
[[Install]] {{Pkg|powerdevil}} for an integrated power saving service called "'''Powerdevil Power Management'''", that may adjust the power saving profile of the system and/or the brightness of the screen (if supported).
* {{AUR|kcm-ufw}}
 
  
'''Configuration for [[PolicyKit]]'''
+
{{Accuracy|Regarding the note below, it might be that the problem is the logind setting ''LidSwitchIgnoreInhibited'' which defaults to ''yes''. [https://bbs.archlinux.org/viewtopic.php?pid&#61;1649022#p1649022]}}
* {{AUR|kcm-polkit-kde-git}}
 
  
'''Configuration for Wacom Tablet'''
+
{{Note|Powerdevil may not [[Power management#Power managers|inhibit]] all logind settings (such as the lid close action for laptops). In these cases, the logind setting itself will need to be changed - see [[Power management#Power management with systemd]].}}
* {{AUR|kcm-wacomtablet}}
 
  
More KCM can be found [http://kde-apps.org/index.php?xcontentmode=273 here].
+
=== Autostarting applications ===
  
== Desktop search and semantic desktop ==
+
Plasma can autostart applications and run scripts on startup and shutdown. To autostart an application, navigate to ''System Settings > Startup and Shutdown > Autostart'' and add the program or shell script of your choice. For applications, a {{ic|.desktop}} file will be created, for shell scripts, a symlink will be created.
  
According to [https://en.wikipedia.org/wiki/Semantic_desktop Wikipedia], ''"the Semantic Desktop is a collective term for ideas related to changing a computer's user interface and data handling capabilities so that data is more easily shared between different applications or tasks and so that data that once could not be automatically processed by a computer can be (automatically processed)."''
+
{{Note|
 +
* Programs can be autostarted on login only, whilst shell scripts can also be run on shutdown or even before Plasma itself starts.
 +
* Shell scripts will only be run if they are marked executable.
 +
}}
  
The KDE implementation of this concept is tied to (as of KDE 4.10) two major pieces of software, Akonadi and Nepomuk. Between the two of them, these programs look at your data and make an easily searchable index of it. The idea behind these pieces of software is to make your system "aware" of your data and give it context using meta-data and user-supplied tags.
+
Place [[Desktop entries]] (i.e. {{ic|.desktop}} files) here:
  
Soprano and Virtuoso are two dependencies of the Nepomuk Semantic Desktop. Since the relationship between the two major components and their dependencies is not very clear, the following sections try to shed some light on their inner workings.
+
; {{ic|~/.config/autostart}}: for starting applications at login.
  
=== Virtuoso and Soprano ===
+
Place or symlink shell scripts in one of the following directories:
  
The database used to store all the metadata used by the semantic desktop is a ''[https://en.wikipedia.org/wiki/Resource_Description_Framework Resource Description Framework (RDF)]'' database called Virtuoso. Internally, Virtuoso may be looked as a relational database. (A [https://en.wikipedia.org/wiki/Relational_model relational database] is different from a traditional single-table based database in the sense that it uses multiple tables related by a single key in order to store data.) It is currently controlled by OpenLink, and is available under commercial and an open source license.
+
; {{ic|~/.config/plasma-workspace/env}}: for executing scripts at login before launching Plasma.
 +
; {{ic|~/.config/autostart-scripts}}: for executing scripts at login.
 +
; {{ic|~/.config/plasma-workspace/shutdown}}: for executing scripts on shutdown.
  
From the [http://techbase.kde.org/Projects/Nepomuk/ComponentOverview#Soprano KDE Techbase], ''Soprano is a Qt abstraction over databases. It provides a friendly Qt-based API for accessing different RDF stores. It currently supports 3 database backends - Sesame, Redland and Virtuoso. The KDE Semantic Stack only works with Virtuoso. Soprano also provides additional features such as serializing, parsing RDF data, and a client server architecture that is heavily used in Nepomuk.''
+
=== Phonon ===
  
=== Nepomuk ===
+
From [[Wikipedia:Phonon (software)|Wikipedia]]:
  
Nepomuk stands for "Networked Environment for Personal, Ontology-based Management of Unified Knowledge". It is what allows all the tagging and labeling of files as well to take place and also serves as the way to actually read the Virtuoso databases. It provides an API to application developers which allows them to read the data collected by it.
+
:''“Phonon is the multimedia API provided by KDE and is the standard abstraction for handling multimedia streams within KDE software and also used by several Qt applications.
  
In the past, the "Strigi" service was used to collect data about the various files present on the system. However, due to many reasons, the most important of them being CPU and Memory usage, Strigi was replaced by a homegrown indexing service which is integrated with Nepomuk-Core.
+
Phonon was originally created to allow KDE and Qt software to be independent of any single multimedia framework such as GStreamer or xine and to provide a stable API for a major version's lifetime.”''
  
For further information about Nepomuk, [http://techbase.kde.org/Projects/Nepomuk/ComponentOverview#Nepomuk_Components this page] is a good resource. However, some of the information in the previous page has been rendered outdated according to [http://vhanda.in/blog/2012/11/nepomuk-without-strigi/ this blog post].
+
'''Phonon''' is being widely used within KDE, for both audio (e.g., the System notifications or KDE audio apps) and video (e.g., the Dolphin video thumbnails).
  
==== Using and configuring Nepomuk ====
+
==== Which backend should I choose? ====
  
In order to search using Nepouk on the KDE desktop, press {{ic|ALT+F2}} and type in your query. Nepomuk is enabled by default. It can be turned on and off in
+
You can choose between backends based on [[GStreamer]] and [[VLC]] – each available in versions for Qt4 applications and Qt5 applications ({{Pkg|phonon-qt4-gstreamer}}, {{Pkg|phonon-qt5-gstreamer}} – {{Pkg|phonon-qt4-vlc}}, {{Pkg|phonon-qt5-vlc}}).
System Settings > Desktop Search
 
  
Nepomuk has to keep track of a lot of files. It is for this reason that it is recommended to increase the number of files that can be watched with inotify. In order to do that this command is a good option.
+
[https://www.phoronix.com/scan.php?page=news_item&px=MTUwNDM Upstream prefers VLC] but prominent Linux distributions (Kubuntu and Fedora-KDE for example) prefer GStreamer because that allows them to easily leave out patented MPEG codecs from the default installation. Both backends have a slightly different [https://community.kde.org/Phonon/FeatureMatrix features set].
sysctl fs.inotify.max_user_watches=524288
 
  
To do it persistently:
+
In the past other backends were developed as well but are no longer maintained and their AUR packages have been deleted.
echo "fs.inotify.max_user_watches = 524288" >> /etc/sysctl.d/99-inotify.conf
 
  
Restart Nepomuk to see the changes.
+
{{Note|1=<br>
 +
* Multiple backends can be installed at once and prioritized at ''System Settings > Multimedia > Backend''.
 +
* According to the [https://forum.kde.org/viewtopic.php?f=250&t=126476&p=335080 KDE forums], the VLC backend lacks support for [[wikipedia:ReplayGain|ReplayGain]].
 +
* If you choose the vlc backend, you may experience crashes every time kde wants to send you a audible warning (and in quite a number of other cases as well, see [https://forum.kde.org/viewtopic.php?f=289&t=135956])
 +
* A possible fix is to run
 +
{{bc|# /usr/lib/vlc/vlc-cache-gen -f /usr/lib/vlc/plugins}}
 +
}}
  
====KDE without Nepomuk====
+
== Applications ==
  
If you wish to run KDE without Nepomuk, there exists a {{AUR|nepomuk-core-fake}} package in the AUR.
+
The KDE project provides a suite of applications that integrate with the Plasma desktop. See the {{Grp|kde-applications}} group for a full listing of the available applications. Also see [[:Category:KDE]] for related KDE application pages.
{{Warning|As of now, Dolphin depends on {{Pkg|nepomuk-widgets}} and hence will break if used with the fake Nepomuk package}}
 
  
=== Akonadi ===
+
Aside from the programs provided in KDE Applications, there are many other applications available that can complement the Plasma desktop. Some of these are discussed below.
  
Akonadi is a system meant to act as a local cache for PIM data, regardless of its origin, which can be then used by other applications. This includes the user's emails, contacts, calendars, events, journals, alarms, notes, and so on. It interfaces with the Nepomuk libraries to provide searching capabilities.
+
=== System administration ===
  
Akonadi does not store any data by itself: the storage format depends on the nature of the data (for example, contacts may be stored in vcard format).
+
==== Terminate Xorg server through KDE System Settings ====
  
For more information on Akonadi and its relationship with Nepomuk, see [http://blogs.kde.org/node/4503] and [http://cmollekopf.wordpress.com/2013/02/13/kontact-nepomuk-integration-why-data-from-akonadi-is-indexed-in-nepomuk/].
+
Navigate to the submenu ''System Settings > Input Devices > Keyboard > Advanced (tab) > "Key Sequence to kill the X server"'' and ensure that the checkbox is ticked.
  
==== Disabling Akonadi ====
+
==== KCM ====
  
See this [http://userbase.kde.org/Akonadi#Disabling_the_Akonadi_subsystem section in the KDE userbase].
+
KCM stands for '''KC'''onfig '''M'''odule. KCMs can help you configure your system by providing interfaces in System Settings, or through the command line with ''kcmshell5''.
  
==== Database configuration ====
+
* {{App|kde-gtk-config|GTK2 and GTK3 Configurator for KDE.|https://cgit.kde.org/kde-gtk-config.git|{{Pkg|kde-gtk-config}}}}
 +
* {{App|KCM Qt Graphics System|This KCM allows you to easily configure the standard Qt graphics system.|https://www.linux-apps.com/p/1127857/|{{AUR|kcm-qt-graphicssystem}}}}
 +
* {{App|UFW KControl Module|KDE4 control module for UFW ([[Uncomplicated Firewall]]).|https://www.linux-apps.com/p/1127851/|{{AUR|kcm-ufw}}}}
 +
* {{App|System policies|Set of configuration modules which allows administrator to change [[PolicyKit]] settings.|https://cgit.kde.org/polkit-kde-kcmodules-1.git|{{AUR|kcm-polkit-kde-git}}}}
 +
* {{App|wacom tablet|KDE GUI for the Wacom Linux Drivers.|https://www.linux-apps.com/p/1127862/|{{AUR|kcm-wacomtablet}}}}
 +
* {{App|Kcmsystemd|systemd control module for KDE.|https://github.com/rthomsen/kcmsystemd|{{Pkg|systemd-kcm}}}}
  
Start {{ic|akonaditray}} from package {{Pkg|kdepim-runtime}}. Right click on it and select '''configure'''. In the Akonadi server configure tab, you can:
+
More KCMs can be found at [https://www.linux-apps.com/search?projectSearchText=KCM linux-apps.com].
* Configuring Akonadi to use MySQL Server running on the System
 
* Configuring Akonadi to use sqlite
 
  
==== Running KDE without Akonadi ====
+
=== Desktop search ===
  
The package {{AUR|akonadi-fake}} is a good option for those who wish to run KDE without Akonadi.
+
KDE implements desktop search with a software called Baloo, a file indexing and searching solution.
  
== Phonon ==
+
==== Baloo ====
  
=== What is Phonon? ===
+
===== Using and configuring Baloo =====
  
From [[Wikipedia:Phonon|Wikipedia]]:
+
In order to search using Baloo on the Plasma desktop, start krunner (default keyboard shortcut {{ic|ALT+F2}}) and type in your query. Within Dolphin press {{ic|CTRL+F}}.
''Phonon is the multimedia API for KDE 4. Phonon was created to allow KDE 4 to be independent of any single multimedia framework such as GStreamer or xine and to provide a stable API for KDE 4's lifetime. It was done for various reasons: to create a simple KDE/Qt style multimedia API, to better support native multimedia frameworks on Windows and Mac OS X, and to fix problems of frameworks becoming unmaintained or having API or ABI instability.
 
''
 
  
'''Phonon''' is being widely used within KDE, for both audio (e.g., the System notifications or KDE audio apps) and video (e.g., the Dolphin video thumbnails).
+
By default the Desktop Search KCM exposes only two options: A panel to blacklist folders and a way to disable it with one click.
  
=== Which backend should I choose? ===
+
Alternatively you can edit your {{ic|~/.config/baloofilerc}} file ([https://community.kde.org/Baloo/Configuration info]). Additionally the {{ic|balooctl}} process can also be used. In order to disable Baloo run {{ic|balooctl stop}} and {{ic|balooctl disable}}.
  
You can choose between various backends, like GStreamer ({{Pkg|phonon-gstreamer}}) or VLC ({{Pkg|phonon-vlc}}) available in the [[official repositories]], Xine ({{AUR|phonon-xine}}) or  MPlayer ({{AUR|phonon-mplayer-git}}) available on [[AUR]].  Most users will want GStreamer or VLC which have the best upstream support. Note that multiple backends can be installed at once and you can switch between them via ''System Settings > Multimedia > Phonon > Backend''.
+
Once you added additional folders to the blacklist or disabled Baloo entirely, a process named {{ic|baloo_file_cleaner}} removes all unneeded index files automatically. They are stored under {{ic|~/.local/share/baloo/}}.
  
{{Note|According to the [http://userbase.kde.org/Phonon#Backend_libraries KDE UserBase], Phonon-MPlayer and Phonon-Xine are currently unmaintained}}
+
===== How do I index a removable device? =====
  
According to [https://www.archlinux.org/news/kde-sc-46-to-extra/ announcement of KDE 4.6 in Arch] and [http://mail.kde.org/pipermail/phonon-backends/2011-February/000500.html mail in Phonon dev list], users should prefer GStreamer over VLC due to the feature difference.
+
By default every removable device is blacklisted. You just have to remove your device from the blacklist in the KCM panel.
  
== Useful applications ==
+
=== Web browsers ===
  
The official set of KDE applications may be found [http://www.kde.org/applications/ here].
+
* {{App|[[Wikipedia:Konqueror|Konqueror]]|Part of the KDE project, supports two rendering engines – KHTML and the [[Chromium]]-based Qt WebEngine.|https://konqueror.org/|{{Pkg|konqueror}}}}
 +
* {{App|[[Wikipedia:QupZilla|QupZilla]]|A Qt web browser with Plasma integration features. It uses Qt WebEngine.|https://www.qupzilla.com/|{{Pkg|qupzilla}}}}
 +
* {{App|[[Chromium]]|Chromium and its proprietary variant Google Chrome have limited Plasma integration. [[KDE Wallet#KDE Wallet for Chrome and Chromium|They can use KWallet]] and KDE Open/Save windows.|https://www.chromium.org/|{{Pkg|chromium}}}}
 +
* {{App|[[Firefox]]|Firefox can be configured to better integrate with Plasma. See [[Firefox#KDE/GNOME integration|Firefox KDE integration]] for details.|https://mozilla.org/firefox|{{Pkg|firefox}}}}
  
=== Yakuake ===
+
=== PIM ===
  
[http://yakuake.kde.org/ This] application provides a Quake-like terminal emulator, which is toggled visible using the F12 key. It also has support for multiple tabs. Yakuake can be installed by package {{Pkg|yakuake}}.
+
KDE offers its own stack for personal information management. This includes emails, contacts, calendar, etc. To install all the PIM packages, you could use the meta-package {{Pkg|kdepim-meta}}.
  
=== KDE Telepathy ===
+
==== Akonadi ====
  
[http://community.kde.org/KTp KDE Telepathy] is a project with the goal to closely integrate Instant Messaging with the KDE desktop. It utilizes the Telepathy framework as a backend, and is intended to replace Kopete.
+
Akonadi is a system meant to act as a local cache for PIM data, regardless of its origin, which can be then used by other applications. This includes the user's emails, contacts, calendars, events, journals, alarms, notes, and so on.
  
To install all Telepathy protocols install the {{Grp|telepathy}} group.
+
Akonadi does not store any data by itself: the storage format depends on the nature of the data (for example, contacts may be stored in vCard format).
To use the KDE Telepathy client, install the {{Pkg|kde-telepathy-meta}} package that includes all the packages contained in the {{Grp|kde-telepathy}} group .
 
  
== Tips and tricks ==
+
===== Installation =====
  
=== Configure KWin to use OpenGL ES ===
+
Install {{Pkg|akonadi}}. For additional addons, install {{Pkg|kdepim-addons}}.
  
Beginning with KWin version 4.8 it is possible to use the separately built binary '''kwin_gles''' as a replacement for kwin. It behaves almost the same as the kwin executable in OpenGL2 mode with the slight difference that it uses ''egl'' instead of ''glx'' as the native platform interface. To test kwin_gles you just have to run {{ic|kwin_gles --replace}} in Konsole.
+
{{Note|If you wish to use a database engine other than MariaDB/MySQL, then when installing the {{Pkg|akonadi}} package, use the following command to skip installing the {{Pkg|mariadb}} dependencies:
If you want to make this change permanent you have to create a script in {{ic|$(kde4-config --localprefix)/env/}} which exports {{ic|1=KDEWM=kwin_gles}}.
 
  
=== Enabling audio thumbnails under Konqueror/Dolphin file managers ===
+
{{bc|# pacman -S akonadi --assume-installed mariadb}}
  
For thumbnails of audio files in Konqueror and Dolphin install {{AUR|audiothumbs}} from AUR.
+
}}
  
=== Enabling video thumbnails under Konqueror/Dolphin file managers ===
+
===== Disabling Akonadi =====
  
For thumbnails of videos in konqueror and dolphin install {{Pkg|kdemultimedia-mplayerthumbs}} or {{Pkg|kdemultimedia-ffmpegthumbs}}.
+
See this [https://userbase.kde.org/Akonadi#Disabling_the_Akonadi_subsystem section in the KDE userbase].
  
=== Speed up application startup ===
+
===== Database configuration =====
  
User Rob wrote on his blog this "[http://kdemonkey.blogspot.nl/2008/04/magic-trick.html magic trick]" to improve applications start up by 50-150ms.
+
====== MariaDB/MySQL (using ZFS) ======
To enable it, create this folder in your home:
 
$ mkdir -p ~/.compose-cache
 
  
''For those curious about what is going on here, this enables an optimization which Lubos (of general KDE speediness fame) came up with some time ago and was then rewritten and integrated into libx11. Ordinarily on startup applications read input method information from {{ic|/usr/share/X11/locale/<your locale>/Compose}}. This Compose file is quite long (>5000 lines for the en_US.UTF-8 one) and takes some time to process. libX11 can create a cache of the parsed information which is much quicker to read subsequently, but it will only re-use an existing cache or create a new one in {{ic|~/.compose-cache}} if the directory already exists.'' [Cit. Rob]
+
If your home directory is on a ZFS pool, you will need to create {{ic|~/.config/akonadi/mysql-local.conf}} with the following contents:
  
=== Hiding partitions ===
+
[mysqld]
 +
innodb_use_native_aio = 0
  
In Dolphin, it is as simple as right-clicking on the partition in the 'Places' sidebar and selecting 'Hide <partition>'. Otherwise...
+
Otherwise you will get the [[MySQL#OS error 22 when running on ZFS|OS error 22]]
  
If you wish to prevent your internal partitions from appearing in your file manager, you can create an udev rule, for example {{ic|/etc/udev/rules.d/10-local.rules}}:
+
====== PostgreSQL ======
  
KERNEL=="sda[0-9]", ENV{UDISKS_IGNORE}="1"
+
Install and setup [[PostgreSQL]]. Make sure {{ic|postgresql.service}} is [[started]].
  
The same thing for a certain partition:
+
Edit Akonadi configuration file so that it has the following contents:
  
KERNEL=="sda1", ENV{UDISKS_IGNORE}="1"
+
{{hc|~/.config/akonadi/akonadiserverrc|<nowiki>
KERNEL=="sda2", ENV{UDISKS_IGNORE}="1"
+
[%General]
 +
Driver=QPSQL
  
=== Konqueror tips ===
+
[QPSQL]
 +
Host=/run/postgresql/
 +
InitDbPath=/usr/bin/initdb
 +
Name=akonadi
 +
Options=
 +
Password=
 +
Port=5432
 +
ServerPath=/usr/bin/pg_ctl
 +
StartServer=true
 +
User=postgres
 +
</nowiki>}}
  
==== Disabling smart key tooltips (browser) ====
+
{{Note|If your PostgreSQL database username, password, and port differ from {{ic|postgres}}, {{ic|}} (nothing), and {{ic|5432}}, then make sure you respectively change the configuration options, {{ic|1=User=}}, {{ic|1=Password=}}, and {{ic|1=Port=}}.}}
  
To disable those smart key tooltips in Konqueror (pressing {{ic|Ctrl}} on a web page), open {{ic|~/.kde4/share/config/konquerorrc}} and add this section:
+
Start Akonadi with {{ic|akonadictl start}}, and check its status: {{ic|akonadictl status}}.
  
[Access Keys]
+
====== SQLite ======
Enabled=false
 
  
==== Disabling the sidebar tab (filemanager) ====
+
Edit Akonadi configuration file to match the configuration below:
  
To disable this small sidebar tab on the left side, open {{ic|~/.kde4/share/config/konqsidebartng.rc}} and set {{ic|HideTabs}} to {{ic|true}}.
+
{{hc|~/.config/akonadi/akonadiserverrc|2=
 +
[%General]
 +
Driver=QSQLITE3
  
==== Using WebKit ====
+
[QSQLITE3]
 +
Name=/home/''username''/.local/share/akonadi/akonadi.db
 +
}}
  
WebKit is an open source browser engine developed by Apple Inc. It is a derivative from the KHTML and KJS libraries and contains many improvements. WebKit is used by Safari, Google Chrome and rekonq.
+
=== KDE Telepathy ===
  
It is possible to use WebKit in Konqueror instead of KHTML. First install the {{Pkg|kwebkitpart}} package.
+
[https://community.kde.org/KTp KDE Telepathy] is a project with the goal to closely integrate Instant Messaging with the KDE desktop. It utilizes the Telepathy framework as a backend and is intended to replace Kopete.
  
Then, after executing Konqueror, press ''Settings > Configure Konqueror''.  
+
To install all Telepathy protocols, install the {{Grp|telepathy}} group.
 +
To use the KDE Telepathy client, install the {{Pkg|telepathy-kde-meta}} package that includes all the packages contained in the {{Grp|telepathy-kde}} group.
  
On the ''General'' submenu, select ''WebKit'' as the ''Default web browser engine''.
+
==== Use Telegram with KDE Telepathy ====
  
=== Firefox integration ===
+
[[Telegram]] protocol is available using {{pkg|telepathy-haze}}, installing {{aur|telegram-purple}} or {{aur|telegram-purple-git}} and {{aur|telepathy-morse-git}}. The username is the Telegram account telephone number (complete with the national prefix {{ic|+''xx''}}, e.g. {{ic|+49}} for Germany).
  
See [[Firefox#KDE_integration]].
+
The configuration through the GUI may be tricky: if the phone number is not accepted when configuring a new account in the KDE Telepathy client (with an error message complaining about an invalid parameter which prevents the account creation), insert it between single quotes and then remove the quotes manually from the configuration file ({{ic|~/.local/share/telepathy/mission-control/accounts.cfg}}) after the account creation (if the quotes are not removed after, an authentication error should rise).
  
== Troubleshooting ==
+
{{Note|The configuration file should be edited manually when KDE Telepathy is not running, e.g. when there is no KDE desktop session active, otherwise manual changes may be overwritten by the software.}}
=== Configuration related ===
 
Many issues in KDE are related to configuration. One way to resolve upgrade problems is to start over with a fresh KDE config.  
 
  
==== Reset all KDE configuration ====
+
=== Integrate Android ===
  
To test whether your config is the problem try quitting your KDE session by logging out and, in a tty, run
+
[https://community.kde.org/KDEConnect KDE Connect] provides several features for you:
$ mv ~/.kde4 ~/.kde4.safekeeping
 
$ rm .kde4/{cache,socket,tmp}-$(hostname)
 
  
The rm command just removes symbolic links which will be recreated by KDE automatically. Now start a new KDE session to see the results.
+
* Share files and URLs to/from KDE from/to any app, without wires.
 +
* Touchpad emulation: Use your phone screen as your computer's touchpad.
 +
* Notifications sync (4.3+): Read your Android notifications from the desktop.
 +
* Shared clipboard: copy and paste between your phone and your computer.
 +
* Multimedia remote control: Use your phone as a remote for Linux media players.
 +
* WiFi connection: no usb wire or bluetooth needed.
 +
* RSA Encryption: your information is safe.
  
If the problem is resolved, you will have a fresh, problem-free ~/.kde4. You can gradually move parts of your saved configuration back, restarting your session regularly to test, to identify the problematic parts of your config. Some files here are named after applications so you will probably be able to test these without needing to restart KDE.
+
You will need to install KDE Connect both on your computer and on your Android. For PC side, install {{Pkg|kdeconnect}} package. For Android side, install {{ic|KDE Connect}} from [https://play.google.com/store/apps/details?id=org.kde.kdeconnect_tp Google Play] or from [https://f-droid.org/repository/browse/?fdid=org.kde.kdeconnect_tp F-Droid].
  
==== File Indexer Service not working even after enabling everything properly ====
+
It is possible to use KDE Connect even if you do not use the Plasma desktop. For desktop environments that use AppIndicators, such as Unity, install {{AUR|indicator-kdeconnect}} package as well.
  
This is caused due to a corrupted Nepomuk database. It may be remedied by moving the database or deleting it all together. Log out of KDE and issue this command from a virtual console:
+
== Tips and tricks ==
  
$ mv ~/.kde4/share/apps/nepomuk ~/.kde4/share/apps/nepomuk_backup
+
=== Using an alternative window manager ===
  
to move your existing (and corrupt) nepomuk database. It will be recreated when you log in again.
+
The component chooser settings in Plasma does not allow changing the window manager anymore. [https://github.com/KDE/plasma-desktop/commit/2f83a4434a888cd17b03af1f9925cbb054256ade]
 +
In order to change the window manager used you need to set the {{ic|KDEWM}} [[environment variable]] before KDE startup. [https://wiki.haskell.org/Xmonad/Using_xmonad_in_KDE] To do that you can create a script called {{ic|set_window_manager.sh}} in {{ic|~/.config/plasma-workspace/env}} and export the {{ic|KDEWM}} variable there. For example to use the i3 window manager :
  
==== Plasma desktop behaves strangely ====
+
{{hc|~/.config/plasma-workspace/env/set_window_manager.sh|2=
 +
export KDEWM=/usr/bin/i3
 +
}}
  
Plasma issues are usually caused by unstable '''plasmoids''' or '''plasma themes'''. First, find which was the last plasmoid or plasma theme you had installed and disable it or uninstall it.
+
And then make it executable :
  
So, if your desktop suddenly exhibits "locking up", this is likely caused by a faulty installed widget. If you cannot remember which widget you installed before the problem began(sometimes it can be an irregular problem), try to track it down by removing each widget until the problem ceases. Then you can uninstall the widget, and file a bug report (bugs.kde.org) '''only if it is an official widget'''. If it is not, I recommend you find the entry on kde-look.org and inform the developer of that widget about the issue (detailing steps to reproduce, etc).
+
{{bc|$ chmod +x ~/.config/plasma-workspace/env/set_window_manager.sh}}
  
If you cannot find the problem, but you do not want ''all'' the KDE settings to be lost, do:
+
==== KDE/Openbox session ====
  
  rm -r ~/.kde4/share/config/plasma*
+
The {{Pkg|openbox}} package provides a session for using KDE with [[Openbox]]. To make use of this session, select ''KDE/Openbox'' from the [[display manager]] menu.
  
This command will '''delete all plasma related configs''' of your user and when you will relogin into KDE, you will have the '''default''' settings back. You should know that this action '''cannot be undone'''. You ought to create a backup folder and copy all the plasma related configs in it.
+
For those starting the session manually, add the following line to your {{ic|.xinitrc}} file:
  
==== Clean cache to resolve upgrade problems ====
+
exec openbox-kde-session
  
The problem may be caused by old cache. Sometimes after an upgrade, the old cache might introduce strange, hard to debug behaviour such as unkillable shells, hangs when changing various settings and several other problems such as ark being unable to unrar or unzip or amarok not recognizing any of your musics. This solution can also resolve problems with KDE and QT programmes looking bad following upgrade.
+
==== Re-enabling compositing effects ====
  
Rebuild your cache with the following commands:
+
When replacing Kwin with a window manager which does not provide a Compositor (such as Openbox), any desktop compositing effects e.g. transparency will be lost. In this case, install and run a separate Composite manager to provide the effects such as [[Xcompmgr]] or [[Compton]].
  
  $ rm ~/.config/Trolltech.conf
+
=== Configuring monitor resolution / multiple monitors ===
  $ kbuildsycoca4 --noincremental
 
  
Hopefully, your problems are now fixed.
+
To enable display resolution management and multiple monitors in Plasma, install {{Pkg|kscreen}}. This adds the additional options to ''Sytem Settings > Display and Monitor''.
  
[https://bbs.archlinux.org/viewtopic.php?id=135301 Reference].
+
=== Disable opening application launcher with Super key (Windows key) ===
  
=== Clean akonadi configuration to fix kmail ===
+
To disable this feature you currently can run the following command:
First, make sure that KMail is not running.  Then backup configuration:
 
$ mv ~/.local/share/akonadi  ~/.local/share/akonadi-old
 
$ mv ~/.config/akonadi ~/.config/akonadi-old
 
  
Start {{ic|SystemSettings -> Personal}} and remove all the resources. Go back to Dolphin and remove the original {{ic|~/.local/share/akonadi}} and
+
$ kwriteconfig5 --file kwinrc --group ModifierOnlyShortcuts --key Meta ""
{{ic|~/.config/akonadi}} - the copies you made ensure that you can back-track if necessary.
 
  
Now go back to the SystemSettings page and carefully add the necessary resources.  You should see the resource reading in your mail folders. Then start Kontact/KMail to see if it work properly.
+
== Troubleshooting ==
  
=== Getting current state of KWin for support and debug purposes ===
+
=== Configuration related ===
  
This command prints out a wonderful summary of the current state of KWin including used options, used compositing backend and relevant OpenGL driver capabilities. [http://blog.martin-graesslin.com/blog/2012/03/on-getting-help-for-kwin-and-helping-kwin/ See more at Martin's blog]
+
Many problems in KDE are related to configuration.
  
qdbus org.kde.kwin /KWin supportInformation
+
==== Plasma desktop behaves strangely ====
  
=== KDE4 does not finish loading ===
+
Plasma problems are usually caused by unstable '''Plasma widgets''' (colloquially called ''plasmoids'')  or '''Plasma themes'''. First, find which was the last widget or theme you had installed and disable it or uninstall it.
  
There might be a situation in which the graphic driver might create a conflict when starting KDE4. This situation happens after the login but before finishing loading the desktop, making the user wait indefinitely at the loading screen. Until now the only users confirmed to be affected by this are the ones that use Nvidia drivers and KDE4.
+
So, if your desktop suddenly exhibits "locking up", this is likely caused by a faulty installed widget. If you cannot remember which widget you installed before the problem began (sometimes it can be an irregular problem), try to track it down by removing each widget until the problem ceases. Then you can uninstall the widget, and file a bug report (https://bugs.kde.org/) '''only if it is an official widget'''. If it is not, it is recommended you find the entry on https://store.kde.org/ and inform the developer of that widget about the problem (detailing steps to reproduce, etc).
  
A solution for Nvidia users is to edit the file at {{ic|/home/user/.kde4/share/config/kwinrc}} and change the option '''Enabled=true''' to '''false''' in the '''[Compositing]''' section. For more information look at this [https://bbs.archlinux.org/viewtopic.php?pid=932598 thread].
+
If you cannot find the problem, but you do not want ''all'' the settings to be lost, navigate to {{ic|~/.config}}:
  
If a minimal install was done, make sure you installed the required font by your phonon backend listed here: [[KDE#Minimal_install]]
+
$ for j in plasma*; do mv -- "$j" "${j%}.bak"; done
  
=== KDE and Qt programs look bad when in a different window manager ===
+
This command will '''rename all Plasma related configs''' to *.bak (e.g. {{ic|plasmarc.bak}}) of your user and when you will relogin into Plasma, you will have the '''default''' settings back. To undo that action, remove the .bak file extension. If you already have *.bak files, rename, move, or delete them first. It is highly recommended that you create regular backups anyway. See [[Synchronization and backup programs]] for a list of possible solutions.
  
If you are using KDE or Qt programs but not in a full KDE session (specifically, you did not run "startkde"), then as of KDE 4.6.1 you will need to tell Qt how to find KDE's styles (Oxygen, QtCurve etc.)
+
==== Clean cache to resolve upgrade problems ====
  
You just need to set the environment variable QT_PLUGIN_PATH. E.g. put:
+
The [https://bbs.archlinux.org/viewtopic.php?id=135301 problem] may be caused by old cache. Sometimes after an upgrade, the old cache might introduce strange, hard to debug behaviour such as unkillable shells, hangs when changing various settings and several other problems such as ark being unable to unrar or unzip or amarok not recognizing any of your music. This solution can also resolve problems with KDE and Qt programmes looking bad following upgrade.
  
export QT_PLUGIN_PATH=$HOME/.kde4/lib/kde4/plugins/:/usr/lib/kde4/plugins/
+
Rebuild your cache with the following commands:
  
into your {{ic|/etc/profile}} (or {{ic|~/.profile}} if you do not have root access). qtconfig should then be able to find your kde styles and everything should look nice again!
+
$ rm ~/.config/Trolltech.conf
 +
$ kbuildsycoca5 --noincremental
  
Alternatively, you can symlink the Qt styles directory to the KDE styles one:
+
=== Clean akonadi configuration to fix KMail ===
# ln -s /usr/lib/kde4/plugins/styles/ /usr/lib/qt/plugins/styles
 
  
Under Gnome you can try to install the package libgnomeui.
+
First, make sure that KMail is not running. Then backup configuration:
  
=== Graphical related issues ===
+
$ cp -a ~/.local/share/akonadi ~/.local/share/akonadi-old
 +
$ cp -a ~/.config/akonadi ~/.config/akonadi-old
  
==== Low 2D desktop performance (or) artifacts appear when on 2D ====
+
Start ''SystemSettings > Personal'' and remove all the resources. Go back to Dolphin and remove the original {{ic|~/.local/share/akonadi}} and
 +
{{ic|~/.config/akonadi}} - the copies you made ensure that you can back-track if necessary.
  
===== GPU driver problem =====
+
Now go back to the System Settings page and carefully add the necessary resources. You should see the resource reading in your mail folders. Then start Kontact/KMail to see if it work properly.
  
Make sure you have the proper driver for your card installed, so that your desktop is at least 2D accelerated. Follow these articles for more information: [[ATI]], [[NVIDIA]], [[Intel]] for more information, in order to make sure that everything is all right.
+
=== Empty IMAP inbox in KMail ===
The open-source ATI and Intel drivers and the proprietary (binary) Nvidia driver should theoretically provide the best 2D and 3D acceleration.
 
  
===== The Raster engine workaround =====
+
For some IMAP accounts, kmail will show the inbox as a container with all other folders of this account inside. Kmail does not show messages in the inbox container but in all other subfolders, see [https://bugs.kde.org/show_bug.cgi?id=284172 KDE Bug 284172]. To solve this problem simply disable the server side subscribition in the kmail account settings.
  
If this does not solve your problems, maybe your driver does not provide a good '''XRender''' acceleration which the current Qt painter engine relies on by default.
+
=== Getting current state of KWin for support and debug purposes ===
  
You can change the painter engine to software based only by invoking the application with the "'''-graphicssystem raster'''" command line. This rendering engine can be set as the default one by recompiling Qt with the same as configure option, "'''-graphicssystem raster'''".  
+
This command prints out a wonderful summary of the current state of KWin including used options, used compositing backend and relevant OpenGL driver capabilities. See more on [https://blog.martin-graesslin.com/blog/2012/03/on-getting-help-for-kwin-and-helping-kwin/ Martin's blog].
  
The raster paint engine enables the CPU to do the majority of the painting, as opposed to the GPU. You may get better performance, depending on your system. This is basically a work-around for the terrible Linux driver stack, since the CPU should obviously not be doing graphical computations since it is designed for fewer threads of greater complexity, as opposed to the GPU which is many threads but lesser computational strength. So, only use Raster engine if you are having problems or your GPU is much slower than you CPU, otherwise is better to use XRender.
+
$ qdbus org.kde.KWin /KWin supportInformation
  
Since Qt 4.7+, recompiling Qt is not needed. Simply export '''QT_GRAPHICSSYSTEM=raster''', or "opengl", or "native" (for the default). Raster depends on the CPU, OpenGL depends on the GPU and high driver support, and Native is just using the X11 rendering (mixture, usually).
+
=== KF5/Qt5 applications do not display icons in i3/fvwm/awesome ===
  
'''The best and automatic way to do that''' is to install {{AUR|kcm-qt-graphicssystem}} from AUR and configure this particular Qt setting through
+
See [[Qt#Configuration of Qt5 apps under environments other than KDE Plasma]].
  
  System Settings > Qt Graphics System
+
=== Graphical problems ===
  
For more information, consult this [http://apachelog.wordpress.com/2010/09/05/qt-graphics-system-kcm/ KDE Developer blog entry] and/or this [http://labs.trolltech.com/blogs/2009/12/18/qt-graphics-and-performance-the-raster-engine/ Qt Developer blog entry].
+
Make sure you have the proper driver for your GPU installed. See [[Xorg#Driver installation]] for more information. If you have an older card, it might help to [[#Disable desktop effects manually or automatically for defined applications]] or [[#Disable compositing]].
  
==== Low 3D desktop performance====
+
==== Disable desktop effects manually or automatically for defined applications ====
  
KDE begins with desktop effects enabled. Older cards may be insufficient for 3D desktop acceleration. You can disable desktop effects in  
+
Plasma has desktop effects enabled by default and e.g. not every game will disable them automatically. You can disable desktop effects in ''System Settings > Desktop Effects'' and you can toggle desktop effects with {{ic|Alt+Shift+F12}}. Additionally, you can create custom KWin rules to automatically disable/enable compositing when a certain application/window starts under ''System Settings > Window Management > Window Rules''.
System Settings > Desktop Effects
 
or you can toggle desktop effects with {{ic|Alt+Shift+F12}}.
 
  
{{Note| You may encounter such problems with 3D desktop performance even when using a more powerful graphics card, especially the catalyst proprietary driver (fglrx). This driver is known for having issues with 3D acceleration. Visit [[ATI|the ATi Wiki page]] for more troubleshooting.}}
+
==== Disable compositing ====
  
==== Desktop compositing is disabled on my system with a modern Nvidia GPU ====
+
In ''Sytem Settings > Display and Monitor'', uncheck ''Enable compositor on startup'' and restart Plasma.
 
 
Sometimes, KWin may have settings in its configuration file ('''kwinrc''') that ''may'' cause a problem on re-activating the 3D desktop '''OpenGL''' compositing. That could be caused randomly (for example, due to a sudden Xorg crash or restart, and it gets corrupted), so, in case that happens, delete your {{ic|~/.kde4/share/config/kwinrc}} file and relogin. The KWin settings will turn to the KDE default ones and the problem should be probably gone.
 
  
 
==== Flickering in fullscreen when compositing is enabled ====
 
==== Flickering in fullscreen when compositing is enabled ====
  
As of KDE SC 4.6.0, there is an option in systemsettings > Desktop Effect > Advanced > "Suspend desktop effects for fullscreen windows" Uncheck it would tell kwin to disable unredirect fullscren.
+
In ''Sytem Settings > Display and Monitor'', uncheck ''Allow applications to block compositing''. This may harm performance.
  
==== Screen Tearing with desktop compositing enabled ====
+
==== Screen tearing with NVIDIA ====
{{Note|With the recent update of KDE to 4.11, several new Vsync options have been added, which may help with screen tearing.}}
 
  
 +
See [[NVIDIA/Troubleshooting#Avoid screen tearing in KDE (KWin)]].
  
KWin may suffer from screen tearing while desktop effects are enabled. Uncheck the VSync option under System Settings > Desktop Effects > Advanced > "Use Vsync".
+
==== Plasma cursor sometimes shown incorrecty ====
  
For proprietary driver users, ensure that the driver's VSync option is enabled (amdccle for [[amd_catalyst|Catalyst]] users, and nvidia-settings for [[Nvidia]] users).
+
Create the directory {{ic|~/.icons/default}} and inside a file named {{ic|index.theme}} with the following contents:
  
=== Sound problems under KDE ===
+
{{hc|/home/''archie''/.icons/default/index.theme|2=
 +
[Icon Theme]
 +
Inherits=breeze_cursors
 +
}}
  
==== ALSA related problems ====
+
Execute the following command:
  
{{Note|First make sure you have {{Pkg|alsa-lib}} and {{Pkg|alsa-utils}} installed.}}
+
$ ln -s /usr/share/icons/breeze_cursors/cursors ~/.icons/default/cursors
  
===== "Falling back to default" messages when trying to listen to any sound in KDE =====
+
=== Sound problems ===
  
When you encounter such messages:
+
{{Note|First make sure you have {{Pkg|alsa-utils}} installed.}}
:The audio playback device ''<name-of-the-sound-device>'' does not work.
 
:Falling back to default
 
Go to
 
System Settings > Multimedia > Phonon
 
and set the device named "'''default'''" above all the other devices in each box you see.
 
  
===== I cannot play MP3 files when using the GStreamer Phonon backend =====
+
==== No sound after suspend ====
  
That can be solved by installing the GStreamer plugins (package {{Pkg|gstreamer0.10-plugins}}. If you still encounter problems, you can try changing the Phonon backend used by installing another such as {{Pkg|phonon-vlc}}.
+
If there is no sound after suspending and if KMix doesn't show audio devices which should be there, restarting plasmeshell and pulseaudio may help:
Then make sure the backend is preferred via:
 
  System Settings > Multimedia > Phonon > Backend (tab)
 
  
=== Konsole does not save commands' history ===
+
$ killall plasmashell
 +
$ systemctl --user restart pulseaudio.service
 +
$ plasmashell
  
By default console commands' history is saved only when you type 'exit' in console. When you close Konsole with 'x' in the corner it does not happen.
+
Some applications may also need to be restarted in order for sound to play from them again.
To enable autosaving after every command execution you should add following lines into your .bashrc
 
shopt -s histappend
 
[[ "${PROMPT_COMMAND}" ]] && PROMPT_COMMAND="$PROMPT_COMMAND;history -a" || PROMPT_COMMAND="history -a"
 
  
=== KDE password prompts display three bullets per char ===
+
==== "Falling back to default" messages when trying to listen to any sound ====
  
You can change it under ''System Settings > Account Details''. At ''Password & User Account'' the options are:
+
When you encounter such messages:
* Show one bullet for each letter
 
* Show three bullets for each letter
 
* Show nothing
 
 
 
=== Nepomukserver process still autostart even with semantic desktop disabled ===
 
Go to ''' System Settings > Startup and Shutdown > Service Manager > Startup Services''' and uncheck the Nepomuk Search Module.
 
 
 
=== Desktop does not respond for several seconds at startup ===
 
 
 
There is a bug in either [https://bugs.freedesktop.org/show_bug.cgi?id=58758 pulseaudio] or [https://bugs.kde.org/show_bug.cgi?id=312560 kde] that makes the desktop not being usable for a few seconds after it has showed up (for example if you click on the K-menu it does not appears until that waiting time has elapsed).
 
 
 
The workaround is to disable {{ic|/etc/xdg/autostart/pulseaudio.desktop}} by adding the following line at the end (do not omit the semicolon):
 
 
 
NotShowIn=KDE;
 
 
 
Note that you could also remove that file, or renaming it (to pulseaudio.desktop.disable or the like) but then it will not load in other Desktop Managers, and will be restored by a package update.
 
 
 
[http://linuxadvantage.blogspot.fr/2013/01/kde-rather-slow-to-start-pulseaudio.html Reference].
 
 
 
=== Dolphin and File Dialogs are extremely slow to start everytime ===
 
 
 
May be caused by the upower service. If the upower service is not needed on your system, it can be disabled :
 
 
 
  systemctl disable upower
 
  systemctl mask upower
 
 
 
Obviously this will not have any side effect on a desktop system.
 
 
 
=== Default PDF viewer in GTK applications under KDE ===
 
 
 
In some cases when you have installed [[Inkscape]], [[Gimp]] or other graphic programs, GTK applications ([[Firefox]] among all) might not select Okular as the default PDF application, and they are not going to follow the KDE settings on default applications. You can use the following user command to make Okular the default application again.
 
 
 
xdg-mime default kde4-okularApplication_pdf.desktop application/pdf
 
 
 
If you are using a different PDF viewer application, or a different mime-type is misbehaving, you should change {{ic|kde4-okularApplication_pdf.desktop}} and {{ic|application/pdf}} respectively according to your needs.
 
  
For more information, consult [[Default Applications]] wiki page.
+
The audio playback device ''name_of_the_sound_device'' does not work.
 +
Falling back to default
  
=== Problems following updates to KDE packages ===
+
Go to ''System Settings > Multimedia > Phonon'' and set the device named {{ic|default}} above all the other devices in each box you see.
  
If you reboot to problems following a system update involving KDE packages, try rebooting a second time. For some reason, problems often magically resolve themselves following a second reboot.
+
==== MP3 files cannot be played when using the GStreamer Phonon backend ====
  
== Other KDE projects ==
+
This can be solved by installing the GStreamer libav plugin (package {{Pkg|gst-libav}}). If you still encounter problems, you can try changing the Phonon backend used by installing another such as {{Pkg|phonon-qt4-vlc}} or {{Pkg|phonon-qt5-vlc}}.
 +
Then, make sure the backend is preferred via ''System Settings > Multimedia > Backend''.
  
=== Official kde-unstable ===
+
=== Inotify folder watch limit ===
  
When KDE is reaching beta or RC milestone, KDE "unstable" packages are uploaded to the [kde-unstable] repo. They stay there until KDE is declared stable and passes to [extra].
+
If you get the following error:
  
You may add it by adding:
+
KDE Baloo Filewatch service reached the inotify folder watch limit. File changes may be ignored.
  
[kde-unstable]
+
Then you will need to increase the inotify folder watch limit:
SigLevel = PackageRequired
 
Include = /etc/pacman.d/mirrorlist
 
  
to {{ic|/etc/pacman.conf}}
+
# echo 524288 > /proc/sys/fs/inotify/max_user_watches
  
# kde-unstable is based upon testing. Therefore, you need to enable the repositories in the following order: '''kde-unstable, testing, core, extra, community-testing, community'''.
+
To make changes permanent, create {{ic|/etc/sysctl.d/40-max-user-watches.conf}} with:
# To update from a previous KDE installation, run: <code>pacman -Syu</code> or <code>pacman -S kde-unstable/kde</code>
 
# If you don't have KDE installed, you might have difficulties to install it by using groups (limitation of pacman)
 
# '''Subscribe and read the arch-dev-public mailing list'''
 
# Make sure [[#Distro_and_Upstream_bug_report|you make bug reports]] if you find any issues.
 
  
=== Trinity ===
+
fs.inotify.max_user_watches=524288
  
From the release of KDE 4.x, the developers dropped support for KDE 3.5.x. Trinity Desktop Environment is a fork of KDE3 developed by Timothy Pearson ([http://trinitydesktop.org/ trinitydesktop.org]). This project aims to keep the KDE3.5 computing style alive, as well as polish off any rough edges that were present as of KDE 3.5.10. See [[Trinity]] for more info.
+
=== Freezes when using Automount on a NFS volume  ===
  
{{Warning|KDE 3 is no longer maintained and supported by the KDE developers. The "Trinity KDE" is maintained by the Trinity project commmunity. Use KDE 3 on your own risk, regarding any bugs, performance issues or security risks.}}
+
Using [[Fstab#Automount with systemd]] on a [[NFS]] volume may cause freezes, see [https://bugs.kde.org/show_bug.cgi?id=354137 bug report upstream].
  
==Bugs==
+
=== No Suspend/Hibernate options ===
  
It is preferrable that if you find a minor or serious bug, you should visit [https://bugs.archlinux.org the Arch Bug Tracker] or/and [http://bugs.kde.org KDE Bug Tracker] in order to report that. Make sure that you be clear on what you want to report.
+
If your system is able to suspend or hibernate using systemd but do not have these options shown in KDE, make sure {{Pkg|powerdevil}} is installed.
  
If you have any issue and you write about in on the Arch forums, first make sure that you have '''FULLY''' updated your system using a good sync mirror (check [https://www.archlinux.de/?page=MirrorStatus here]) or try [[Reflector]].
+
=== Problems with saving credentials and persistently occurring KWallet dialogs ===
 +
It is not recommended to turn off the KWallet password saving system in the user settings as it is required to save encrypted credentials like WiFi passphrases for each user. Persistently occuring KWallet dialogs can be the consequence of turning it off.
 +
In case you find the dialogs to unlock the wallet annoying when applications want to access it, you can let the login managers {{ic|SDDM}} and {{ic|LightDM}} unlock the wallet at login automatically, see [[KDE_Wallet#Unlock_KDE_Wallet_automatically_on_login|KDE Wallet]]. The first wallet needs to be generated by KWallet (and not user-generated) in order to be usable for system program credentials.
 +
In case you want the wallet credentials not to be opened in memory for every application, you can restrict applications from accessing it with {{Pkg|kwalletmanager}} in the KWallet settings.
 +
If you do not care for credential encryption at all, you can simply leave the password forms blank when KWallet asks for the password while creating a wallet. In this case, applications can access passwords without having to unlock the wallet first.
  
 
== See also ==
 
== See also ==
  
* [http://www.kde.org KDE Homepage]
+
* [https://www.kde.org/ KDE homepage]
* [http://bugs.kde.org KDE Bug Tracker]
+
* [https://bugs.kde.org/ KDE bug tracker]
* [https://bugs.archlinux.org Arch Linux Bug Tracker]
+
* [https://blog.martin-graesslin.com/blog/kategorien/kde/ Martin Graesslin's blog]
* [http://websvn.kde.org KDE WebSVN]
 

Latest revision as of 15:15, 13 January 2018

KDE is a software project currently comprising of a desktop environment known as Plasma, a collection of libraries and frameworks (KDE Frameworks) and several applications (KDE Applications) as well. KDE upstream has a well maintained UserBase wiki. Detailed information about most KDE applications can be found there.

Contents

Installation

Plasma

Before installing Plasma, make sure you have a working Xorg installation on your system.

Install the plasma-meta meta-package or the plasma group. For differences between plasma-meta and plasma reference Creating packages#Meta packages and groups. Alternatively, for a more minimal Plasma installation, install the plasma-desktop package.

To enable support for Wayland in Plasma, also install the plasma-wayland-session package.

KDE applications

To install the full set of KDE Applications, install the kde-applications group or the kde-applications-meta meta-package. Note that this will only install applications, it will not install any version of Plasma.

Unstable releases

See Official repositories#kde-unstable

Starting Plasma

Note: Although it is possible to launch Plasma under Wayland, there are some missing features and known problems as of Plasma 5.11. See the Plasma 5.11 Errata for a list of issues and the Plasma on Wayland workboard for the current state of development. Use Xorg for the most complete and stable experience.

Plasma can be started either using a display manager, or from the console.

Using a display manager

Note: The NVIDIA proprietary driver implementation for Wayland requires EGLStreams. KDE have not implemented EGLStreams in their Wayland implementation. The following workarounds are available:
  • Using the Nouveau driver.
  • Using the (default) Xorg session.

From the console

To start Plasma with xinit/startx, append exec startkde to your .xinitrc file. If you want to start Xorg at login, please see Start X at login. To start a Plasma on Wayland session from a console, run startplasmacompositor.

Configuration

Most settings for KDE applications are stored in ~/.config. However, configuring KDE is primarily done through the System Settings application. It can be started from a terminal by executing systemsettings5.

Personalization

Plasma desktop

Themes

Plasma themes define the look of panels and plasmoids. For easy system-wide installation, some themes are available in both the official repositories and the AUR.

The easiest way to install themes is by going through the System Settings > Workspace Theme > Desktop Theme > Get new Themes.

This will present a frontend for the KDE-Store that allows you to install, uninstall, or update third-party plasmoid scripts.

Splash and Lock screens are currently unavailable. To customize these screens, you have to modify the original theme found in /usr/share/plasma/look-and-feel/. See this thread on the Kubuntu forums.

Note that the SDDM login screen is not part of this theme.

Qt and GTK+ Applications Appearance
Tip: For Qt and GTK theme consistency, see Uniform look for Qt and GTK applications.
Qt4

For Qt4 applications to have a consistent appearance, there are two options:

Install breeze-kde4 and then pick Breeze as GUI Style in qtconfig-qt4; or install breeze-gtk and pick GTK+ as GUI Style.

GTK+

The recommended theme for a pleasant appearance in GTK+ applications is breeze-gtk or gnome-breeze-gitAUR, a GTK+ theme designed to mimic the appearance of Plasma's Breeze theme. Install kde-gtk-config and select the installed GTK-theme for GTK2/GTK3-Theme in System Settings > Application Style > GNOME Application Style.

In some themes, tooltips in GTK+ applications have white text on white backgrounds making it difficult to read. To change the colors in GTK2 applications, find the section for tooltips in the .gtkrc-2.0 file and change it. For GTK3 application two files need to be changed, gtk.css and settings.ini. It might also help to uncheck the option to Apply colors to non-Qt applications under System Settings > Colors.

Some GTK2 programs like vuescan-binAUR still look hardly usable due to invisible checkboxes with the Breeze or Adwaita skin in a Plasma session. To workaround this, install and select e.g. the Numix-Frost-Light skin of the numix-frost-themesAUR under System Settings > Application Style > GNOME Application Style (GTK) > Select a GTK2 Theme:. Numix-Frost-Light looks similar to Breeze.

Widgets

Plasmoids are little scripted (plasmoid scripts) or coded (plasmoid binaries) KDE applications designed to enhance the functionality of your desktop.

The easiest way to install plasmoid scripts is by right-clicking onto a panel or the desktop and choosing Add Widgets > Get new Widgets > Download Widgets. This will present a nice frontend for https://store.kde.org/ that allows you to install, uninstall, or update third-party plasmoid scripts with literally just one click.

Many Plasmoid binaries are available from the AUR.

Sound applet in the system tray

Install plasma-pa or kmix (start Kmix from the Application Launcher). plasma-pa is now installed by default with plasma, no further configuration needed.

Note: To adjust the step size of volume increments/decrements, add e.g. VolumePercentageStep=1 in the [Global] section of ~/.config/kmixrc.
Disable panel shadow

As the Plasma panel is on top of other windows, its shadow is drawn over them. [1] To disable this behaviour without impacting other shadows, install xorg-xprop and run:

$ xprop -remove _KDE_NET_WM_SHADOW

then select the panel with the plus-sized cursor. [2] For automation, install xorg-xwininfo and create the following script:

/usr/local/bin/kde-no-shadow
#!/bin/bash
for WID in $(xwininfo -root -tree | sed '/"Plasma": ("plasmashell" "plasmashell")/!d; s/^  *\([^ ]*\) .*/\1/g'); do
   xprop -id $WID -remove _KDE_NET_WM_SHADOW
done

Set execution permissions for the script:

# chmod 755 /usr/local/bin/kde-no-shadow

The script can be run on login with Add Script in Autostart:

$ kcmshell5 autostart

Window decorations

Window decorations can be changed in System Settings > Application Style > Window Decorations.

There you can also directly download and install more themes with one click, and some are available in the AUR.

Icon themes

Icon themes can be installed and changed on System Settings > Icons.

Note: Although all modern Linux desktops share the same icon theme format, desktops like GNOME use fewer icons (esp. in menus and toolbars). Themes developed for such desktops usually lack icons required by Plasma and KDE apps. It is recommended to install Plasma compatible icon themes instead.

Fonts

Fonts in a Plasma session look poor

Try installing the ttf-dejavu and ttf-liberation packages.

After the installation, be sure to log out and back in. You should not have to modify anything in System Settings > Fonts. If you are using qt5ct, the settings in Qt5 Configuration Tool may override the font settings in System Settings.

If you have personally set up how your Fonts render, be aware that System Settings may alter their appearance. When you go System Settings > Fonts System Settings will likely alter your font configuration file (fonts.conf).

There is no way to prevent this, but, if you set the values to match your fonts.conf file, the expected font rendering will return (it will require you to restart your application or in a few cases restart your desktop). Note that Gnome's Font Preferences also does this.

Fonts are huge or seem disproportional

Try to force font DPI to 96 in System Settings > Fonts.

If that does not work, try setting the DPI directly in your Xorg configuration as documented in Xorg#Setting DPI manually.

Space efficiency

The Plasma Netbook shell has been dropped from Plasma 5, see the following KDE forum post However, you can achieve something similar by editing the file ~/.config/kwinrc adding BorderlessMaximizedWindows=true in the [Windows] section.

Thumbnail generation

To allow thumbnail generation for media or document files on the desktop and in Dolphin, install kdegraphics-thumbnailers, ffmpegthumbs and kde-thumbnailer-odfAUR.

Then enable the thumbnail categories for the desktop via right click on the desktop background > Configure Desktop > Icons > More Preview Options....

In Dolphin, navigate to Control > General > Previews.

Printing

Tip: Use the CUPS web interface for faster configuration. Printers configured in this way can be used in KDE applications.

You can also configure printers in System Settings > Printers. To use this method, you must first install print-manager and cups. See CUPS#Configuration.

Samba/Windows support

If you want to have access to Windows services, install Samba (package samba).

The Dolphin share functionality requires the package kdenetwork-filesharing and usershares, which the stock smb.conf does not have enabled. Instructions to add them are in Samba#Creating usershare path, after which sharing in Dolphin should work out of the box after restarting Samba.

Plasma's abilities to access SMB shares are limited, though. Writing to Windows shares is problematic and opening files from such shares, e.g. large videos, makes Plasma copying the whole file to the local system first. To workaround this, you can install a GTK based file browser like thunar with gvfs and gvfs-smb (and gnome-keyring for saving login credentials) to access SMB shares in a more able way. Another possible workaround is to mount a Samba share via cifs-utils to make it look to Plasma like if the SMB share was just a normal local folder and thus can be accessed normally. The mount command could look like the following for write access to a public share:

# mount -t cifs -o username=*,password=*,uid=1000,gid=1000,file_mode=0660,dir_mode=0770 //networkhost/share/ /home/user/localmountpoint/

Make it permanent:

/etc/fstab
//networkhost/share/ /home/user/localmountpoint/ cifs defaults,username=*,password=*,uid=1000,gid=1000,file_mode=0660,dir_mode=0770 0 2

It might be necessary to append .local to the hostname. For some NAS devices it might also be necessary to append vers=1.0 to the argument line to enforce SMB 1.0 compatibility.

An easier solution is to use samba-mounter-gitAUR, which offers basically the same functionality via an easy to use option located at System Settings > Network Drivers.

KDE Desktop activities

KDE Desktop Activities are special workspaces where you can select specific settings for each activity that apply only when you are using said activity.

Power saving

Install powerdevil for an integrated power saving service called "Powerdevil Power Management", that may adjust the power saving profile of the system and/or the brightness of the screen (if supported).

Tango-inaccurate.pngThe factual accuracy of this article or section is disputed.Tango-inaccurate.png

Reason: Regarding the note below, it might be that the problem is the logind setting LidSwitchIgnoreInhibited which defaults to yes. [3] (Discuss in Talk:KDE#)
Note: Powerdevil may not inhibit all logind settings (such as the lid close action for laptops). In these cases, the logind setting itself will need to be changed - see Power management#Power management with systemd.

Autostarting applications

Plasma can autostart applications and run scripts on startup and shutdown. To autostart an application, navigate to System Settings > Startup and Shutdown > Autostart and add the program or shell script of your choice. For applications, a .desktop file will be created, for shell scripts, a symlink will be created.

Note:
  • Programs can be autostarted on login only, whilst shell scripts can also be run on shutdown or even before Plasma itself starts.
  • Shell scripts will only be run if they are marked executable.

Place Desktop entries (i.e. .desktop files) here:

~/.config/autostart
for starting applications at login.

Place or symlink shell scripts in one of the following directories:

~/.config/plasma-workspace/env
for executing scripts at login before launching Plasma.
~/.config/autostart-scripts
for executing scripts at login.
~/.config/plasma-workspace/shutdown
for executing scripts on shutdown.

Phonon

From Wikipedia:

“Phonon is the multimedia API provided by KDE and is the standard abstraction for handling multimedia streams within KDE software and also used by several Qt applications.

Phonon was originally created to allow KDE and Qt software to be independent of any single multimedia framework such as GStreamer or xine and to provide a stable API for a major version's lifetime.”

Phonon is being widely used within KDE, for both audio (e.g., the System notifications or KDE audio apps) and video (e.g., the Dolphin video thumbnails).

Which backend should I choose?

You can choose between backends based on GStreamer and VLC – each available in versions for Qt4 applications and Qt5 applications (phonon-qt4-gstreamer, phonon-qt5-gstreamerphonon-qt4-vlc, phonon-qt5-vlc).

Upstream prefers VLC but prominent Linux distributions (Kubuntu and Fedora-KDE for example) prefer GStreamer because that allows them to easily leave out patented MPEG codecs from the default installation. Both backends have a slightly different features set.

In the past other backends were developed as well but are no longer maintained and their AUR packages have been deleted.

Note:
  • Multiple backends can be installed at once and prioritized at System Settings > Multimedia > Backend.
  • According to the KDE forums, the VLC backend lacks support for ReplayGain.
  • If you choose the vlc backend, you may experience crashes every time kde wants to send you a audible warning (and in quite a number of other cases as well, see [4])
  • A possible fix is to run
# /usr/lib/vlc/vlc-cache-gen -f /usr/lib/vlc/plugins

Applications

The KDE project provides a suite of applications that integrate with the Plasma desktop. See the kde-applications group for a full listing of the available applications. Also see Category:KDE for related KDE application pages.

Aside from the programs provided in KDE Applications, there are many other applications available that can complement the Plasma desktop. Some of these are discussed below.

System administration

Terminate Xorg server through KDE System Settings

Navigate to the submenu System Settings > Input Devices > Keyboard > Advanced (tab) > "Key Sequence to kill the X server" and ensure that the checkbox is ticked.

KCM

KCM stands for KConfig Module. KCMs can help you configure your system by providing interfaces in System Settings, or through the command line with kcmshell5.

  • kde-gtk-config — GTK2 and GTK3 Configurator for KDE.
https://cgit.kde.org/kde-gtk-config.git || kde-gtk-config
  • KCM Qt Graphics System — This KCM allows you to easily configure the standard Qt graphics system.
https://www.linux-apps.com/p/1127857/ || kcm-qt-graphicssystemAUR
https://www.linux-apps.com/p/1127851/ || kcm-ufwAUR
  • System policies — Set of configuration modules which allows administrator to change PolicyKit settings.
https://cgit.kde.org/polkit-kde-kcmodules-1.git || kcm-polkit-kde-gitAUR
  • wacom tablet — KDE GUI for the Wacom Linux Drivers.
https://www.linux-apps.com/p/1127862/ || kcm-wacomtabletAUR
  • Kcmsystemd — systemd control module for KDE.
https://github.com/rthomsen/kcmsystemd || systemd-kcm

More KCMs can be found at linux-apps.com.

Desktop search

KDE implements desktop search with a software called Baloo, a file indexing and searching solution.

Baloo

Using and configuring Baloo

In order to search using Baloo on the Plasma desktop, start krunner (default keyboard shortcut ALT+F2) and type in your query. Within Dolphin press CTRL+F.

By default the Desktop Search KCM exposes only two options: A panel to blacklist folders and a way to disable it with one click.

Alternatively you can edit your ~/.config/baloofilerc file (info). Additionally the balooctl process can also be used. In order to disable Baloo run balooctl stop and balooctl disable.

Once you added additional folders to the blacklist or disabled Baloo entirely, a process named baloo_file_cleaner removes all unneeded index files automatically. They are stored under ~/.local/share/baloo/.

How do I index a removable device?

By default every removable device is blacklisted. You just have to remove your device from the blacklist in the KCM panel.

Web browsers

  • Konqueror — Part of the KDE project, supports two rendering engines – KHTML and the Chromium-based Qt WebEngine.
https://konqueror.org/ || konqueror
  • QupZilla — A Qt web browser with Plasma integration features. It uses Qt WebEngine.
https://www.qupzilla.com/ || qupzilla
  • Chromium — Chromium and its proprietary variant Google Chrome have limited Plasma integration. They can use KWallet and KDE Open/Save windows.
https://www.chromium.org/ || chromium
https://mozilla.org/firefox || firefox

PIM

KDE offers its own stack for personal information management. This includes emails, contacts, calendar, etc. To install all the PIM packages, you could use the meta-package kdepim-meta.

Akonadi

Akonadi is a system meant to act as a local cache for PIM data, regardless of its origin, which can be then used by other applications. This includes the user's emails, contacts, calendars, events, journals, alarms, notes, and so on.

Akonadi does not store any data by itself: the storage format depends on the nature of the data (for example, contacts may be stored in vCard format).

Installation

Install akonadi. For additional addons, install kdepim-addons.

Note: If you wish to use a database engine other than MariaDB/MySQL, then when installing the akonadi package, use the following command to skip installing the mariadb dependencies:
# pacman -S akonadi --assume-installed mariadb
Disabling Akonadi

See this section in the KDE userbase.

Database configuration
MariaDB/MySQL (using ZFS)

If your home directory is on a ZFS pool, you will need to create ~/.config/akonadi/mysql-local.conf with the following contents:

[mysqld]
innodb_use_native_aio = 0

Otherwise you will get the OS error 22

PostgreSQL

Install and setup PostgreSQL. Make sure postgresql.service is started.

Edit Akonadi configuration file so that it has the following contents:

~/.config/akonadi/akonadiserverrc
[%General]
Driver=QPSQL

[QPSQL]
Host=/run/postgresql/
InitDbPath=/usr/bin/initdb
Name=akonadi
Options=
Password=
Port=5432
ServerPath=/usr/bin/pg_ctl
StartServer=true
User=postgres
Note: If your PostgreSQL database username, password, and port differ from postgres, (nothing), and 5432, then make sure you respectively change the configuration options, User=, Password=, and Port=.

Start Akonadi with akonadictl start, and check its status: akonadictl status.

SQLite

Edit Akonadi configuration file to match the configuration below:

~/.config/akonadi/akonadiserverrc
[%General]
Driver=QSQLITE3

[QSQLITE3]
Name=/home/username/.local/share/akonadi/akonadi.db

KDE Telepathy

KDE Telepathy is a project with the goal to closely integrate Instant Messaging with the KDE desktop. It utilizes the Telepathy framework as a backend and is intended to replace Kopete.

To install all Telepathy protocols, install the telepathy group. To use the KDE Telepathy client, install the telepathy-kde-meta package that includes all the packages contained in the telepathy-kde group.

Use Telegram with KDE Telepathy

Telegram protocol is available using telepathy-haze, installing telegram-purpleAUR or telegram-purple-gitAUR and telepathy-morse-gitAUR. The username is the Telegram account telephone number (complete with the national prefix +xx, e.g. +49 for Germany).

The configuration through the GUI may be tricky: if the phone number is not accepted when configuring a new account in the KDE Telepathy client (with an error message complaining about an invalid parameter which prevents the account creation), insert it between single quotes and then remove the quotes manually from the configuration file (~/.local/share/telepathy/mission-control/accounts.cfg) after the account creation (if the quotes are not removed after, an authentication error should rise).

Note: The configuration file should be edited manually when KDE Telepathy is not running, e.g. when there is no KDE desktop session active, otherwise manual changes may be overwritten by the software.

Integrate Android

KDE Connect provides several features for you:

  • Share files and URLs to/from KDE from/to any app, without wires.
  • Touchpad emulation: Use your phone screen as your computer's touchpad.
  • Notifications sync (4.3+): Read your Android notifications from the desktop.
  • Shared clipboard: copy and paste between your phone and your computer.
  • Multimedia remote control: Use your phone as a remote for Linux media players.
  • WiFi connection: no usb wire or bluetooth needed.
  • RSA Encryption: your information is safe.

You will need to install KDE Connect both on your computer and on your Android. For PC side, install kdeconnect package. For Android side, install KDE Connect from Google Play or from F-Droid.

It is possible to use KDE Connect even if you do not use the Plasma desktop. For desktop environments that use AppIndicators, such as Unity, install indicator-kdeconnectAUR package as well.

Tips and tricks

Using an alternative window manager

The component chooser settings in Plasma does not allow changing the window manager anymore. [5] In order to change the window manager used you need to set the KDEWM environment variable before KDE startup. [6] To do that you can create a script called set_window_manager.sh in ~/.config/plasma-workspace/env and export the KDEWM variable there. For example to use the i3 window manager :

~/.config/plasma-workspace/env/set_window_manager.sh
export KDEWM=/usr/bin/i3

And then make it executable :

$ chmod +x ~/.config/plasma-workspace/env/set_window_manager.sh

KDE/Openbox session

The openbox package provides a session for using KDE with Openbox. To make use of this session, select KDE/Openbox from the display manager menu.

For those starting the session manually, add the following line to your .xinitrc file:

exec openbox-kde-session

Re-enabling compositing effects

When replacing Kwin with a window manager which does not provide a Compositor (such as Openbox), any desktop compositing effects e.g. transparency will be lost. In this case, install and run a separate Composite manager to provide the effects such as Xcompmgr or Compton.

Configuring monitor resolution / multiple monitors

To enable display resolution management and multiple monitors in Plasma, install kscreen. This adds the additional options to Sytem Settings > Display and Monitor.

Disable opening application launcher with Super key (Windows key)

To disable this feature you currently can run the following command:

$ kwriteconfig5 --file kwinrc --group ModifierOnlyShortcuts --key Meta ""

Troubleshooting

Configuration related

Many problems in KDE are related to configuration.

Plasma desktop behaves strangely

Plasma problems are usually caused by unstable Plasma widgets (colloquially called plasmoids) or Plasma themes. First, find which was the last widget or theme you had installed and disable it or uninstall it.

So, if your desktop suddenly exhibits "locking up", this is likely caused by a faulty installed widget. If you cannot remember which widget you installed before the problem began (sometimes it can be an irregular problem), try to track it down by removing each widget until the problem ceases. Then you can uninstall the widget, and file a bug report (https://bugs.kde.org/) only if it is an official widget. If it is not, it is recommended you find the entry on https://store.kde.org/ and inform the developer of that widget about the problem (detailing steps to reproduce, etc).

If you cannot find the problem, but you do not want all the settings to be lost, navigate to ~/.config:

$ for j in plasma*; do mv -- "$j" "${j%}.bak"; done

This command will rename all Plasma related configs to *.bak (e.g. plasmarc.bak) of your user and when you will relogin into Plasma, you will have the default settings back. To undo that action, remove the .bak file extension. If you already have *.bak files, rename, move, or delete them first. It is highly recommended that you create regular backups anyway. See Synchronization and backup programs for a list of possible solutions.

Clean cache to resolve upgrade problems

The problem may be caused by old cache. Sometimes after an upgrade, the old cache might introduce strange, hard to debug behaviour such as unkillable shells, hangs when changing various settings and several other problems such as ark being unable to unrar or unzip or amarok not recognizing any of your music. This solution can also resolve problems with KDE and Qt programmes looking bad following upgrade.

Rebuild your cache with the following commands:

$ rm ~/.config/Trolltech.conf
$ kbuildsycoca5 --noincremental

Clean akonadi configuration to fix KMail

First, make sure that KMail is not running. Then backup configuration:

$ cp -a ~/.local/share/akonadi ~/.local/share/akonadi-old
$ cp -a ~/.config/akonadi ~/.config/akonadi-old

Start SystemSettings > Personal and remove all the resources. Go back to Dolphin and remove the original ~/.local/share/akonadi and ~/.config/akonadi - the copies you made ensure that you can back-track if necessary.

Now go back to the System Settings page and carefully add the necessary resources. You should see the resource reading in your mail folders. Then start Kontact/KMail to see if it work properly.

Empty IMAP inbox in KMail

For some IMAP accounts, kmail will show the inbox as a container with all other folders of this account inside. Kmail does not show messages in the inbox container but in all other subfolders, see KDE Bug 284172. To solve this problem simply disable the server side subscribition in the kmail account settings.

Getting current state of KWin for support and debug purposes

This command prints out a wonderful summary of the current state of KWin including used options, used compositing backend and relevant OpenGL driver capabilities. See more on Martin's blog.

$ qdbus org.kde.KWin /KWin supportInformation

KF5/Qt5 applications do not display icons in i3/fvwm/awesome

See Qt#Configuration of Qt5 apps under environments other than KDE Plasma.

Graphical problems

Make sure you have the proper driver for your GPU installed. See Xorg#Driver installation for more information. If you have an older card, it might help to #Disable desktop effects manually or automatically for defined applications or #Disable compositing.

Disable desktop effects manually or automatically for defined applications

Plasma has desktop effects enabled by default and e.g. not every game will disable them automatically. You can disable desktop effects in System Settings > Desktop Effects and you can toggle desktop effects with Alt+Shift+F12. Additionally, you can create custom KWin rules to automatically disable/enable compositing when a certain application/window starts under System Settings > Window Management > Window Rules.

Disable compositing

In Sytem Settings > Display and Monitor, uncheck Enable compositor on startup and restart Plasma.

Flickering in fullscreen when compositing is enabled

In Sytem Settings > Display and Monitor, uncheck Allow applications to block compositing. This may harm performance.

Screen tearing with NVIDIA

See NVIDIA/Troubleshooting#Avoid screen tearing in KDE (KWin).

Plasma cursor sometimes shown incorrecty

Create the directory ~/.icons/default and inside a file named index.theme with the following contents:

/home/archie/.icons/default/index.theme
[Icon Theme]
Inherits=breeze_cursors

Execute the following command:

$ ln -s /usr/share/icons/breeze_cursors/cursors ~/.icons/default/cursors

Sound problems

Note: First make sure you have alsa-utils installed.

No sound after suspend

If there is no sound after suspending and if KMix doesn't show audio devices which should be there, restarting plasmeshell and pulseaudio may help:

$ killall plasmashell
$ systemctl --user restart pulseaudio.service
$ plasmashell

Some applications may also need to be restarted in order for sound to play from them again.

"Falling back to default" messages when trying to listen to any sound

When you encounter such messages:

The audio playback device name_of_the_sound_device does not work.
Falling back to default

Go to System Settings > Multimedia > Phonon and set the device named default above all the other devices in each box you see.

MP3 files cannot be played when using the GStreamer Phonon backend

This can be solved by installing the GStreamer libav plugin (package gst-libav). If you still encounter problems, you can try changing the Phonon backend used by installing another such as phonon-qt4-vlc or phonon-qt5-vlc. Then, make sure the backend is preferred via System Settings > Multimedia > Backend.

Inotify folder watch limit

If you get the following error:

KDE Baloo Filewatch service reached the inotify folder watch limit. File changes may be ignored.

Then you will need to increase the inotify folder watch limit:

# echo 524288 > /proc/sys/fs/inotify/max_user_watches

To make changes permanent, create /etc/sysctl.d/40-max-user-watches.conf with:

fs.inotify.max_user_watches=524288

Freezes when using Automount on a NFS volume

Using Fstab#Automount with systemd on a NFS volume may cause freezes, see bug report upstream.

No Suspend/Hibernate options

If your system is able to suspend or hibernate using systemd but do not have these options shown in KDE, make sure powerdevil is installed.

Problems with saving credentials and persistently occurring KWallet dialogs

It is not recommended to turn off the KWallet password saving system in the user settings as it is required to save encrypted credentials like WiFi passphrases for each user. Persistently occuring KWallet dialogs can be the consequence of turning it off. In case you find the dialogs to unlock the wallet annoying when applications want to access it, you can let the login managers SDDM and LightDM unlock the wallet at login automatically, see KDE Wallet. The first wallet needs to be generated by KWallet (and not user-generated) in order to be usable for system program credentials. In case you want the wallet credentials not to be opened in memory for every application, you can restrict applications from accessing it with kwalletmanager in the KWallet settings. If you do not care for credential encryption at all, you can simply leave the password forms blank when KWallet asks for the password while creating a wallet. In this case, applications can access passwords without having to unlock the wallet first.

See also