Difference between revisions of "LightDM"

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[[Category:Display managers]]
 
[[Category:Display managers]]
 
[[es:LightDM]]
 
[[es:LightDM]]
 +
[[fr:LightDM]]
 
{{Article summary start}}
 
{{Article summary start}}
 
{{Article summary text|Provides an overview and setup of the Light Display Manager.}}
 
{{Article summary text|Provides an overview and setup of the Light Display Manager.}}
 
{{Article summary heading|Related}}
 
{{Article summary heading|Related}}
 
{{Article summary wiki|Display Manager}}
 
{{Article summary wiki|Display Manager}}
 +
{{Article summary wiki|GDM}}
 +
{{Article summary wiki|KDM}}
 +
{{Article summary wiki|SLiM}}
 
{{Article summary end}}
 
{{Article summary end}}
  
[http://www.freedesktop.org/wiki/Software/LightDM Lightdm] LightDM is a cross-desktop display manager that aims to be the standard display manager for the X.org X server.
+
[http://www.freedesktop.org/wiki/Software/LightDM LightDM] is a cross-desktop display manager that aims to be the standard display manager for the X server. Its key features are:
 +
* A lightweight codebase
 +
* Standards compliant (PAM, ConsoleKit, etc)
 +
* A well defined interface between the server and the user interface.
 +
* Cross-desktop (user interfaces can be written in any toolkit).
 +
 
 +
More details about LightDM's design can be found [http://www.freedesktop.org/wiki/Software/LightDM/Design here].
  
 
== Installation ==
 
== Installation ==
 
+
Install {{Pkg|lightdm}} from the [[official repositories]] or {{AUR|lightdm-bzr}} from the [[AUR]].
Currently,  {{AUR|lightdm}} resides in the [[AUR]]. Install it like any other AUR package.
+
 
+
  
 
=== Greeter===
 
=== Greeter===
You will also need {{AUR|lightdm-gtk-greeter}} from the [[AUR]].
+
You will also need to install a greeter (a user interface for LightDM). The reference greeter is ''lightdm-gtk-greeter'', which is provided by either {{Pkg|lightdm-gtk3-greeter}} or {{Pkg|lightdm-gtk2-greeter}}. KDE users can install {{Pkg|lightdm-kde-greeter}}, a greeter based on Qt.
  
Other greeters can be installed:  
+
Other greeters can be installed from the [[AUR]] as well:  
* {{AUR|lightdm-webkit-greeter}}
+
* {{AUR|lightdm-webkit-greeter}}: A greeter that uses Webkit for theming.
* {{AUR|lightdm-crowd-greeter}}
+
* {{AUR|lightdm-crowd-greeter}}: A 3D greeter that lets you select your profile from 3D characters walking around.
* {{AUR|lightdm-kde}}
+
* {{AUR|lightdm-unity-greeter}}: The greeter used bye Ubuntu's [[Unity]].
* {{AUR|lightdm-unity-greeter}}
+
* {{AUR|razor-lightdm-greeter}}: A greeter for the [[Razor-qt]] desktop environment.
 +
* {{AUR|lightdm-pantheon-greeter}}: A LightDM greeter from the ElementaryOS Project.
  
To change the default greeter ({{AUR|lightdm-gtk-greeter}}) edit the lightdm PKGBUILD and change the line
+
You can change the default greeter at compile time by changing the line containing:
 
  --with-greeter-session=lightdm-gtk-greeter
 
  --with-greeter-session=lightdm-gtk-greeter
 
to
 
to
 
  --with-greeter-session=lightdm-yourgreeter-greeter
 
  --with-greeter-session=lightdm-yourgreeter-greeter
  
To change default greeter by modifying lightdm.conf. <br>
+
Or, more easily, change the configuration file to state:
{{bc|greeter-session&#61;lightdm-kde-greeter}}Lightdm.conf can be found at :<br>
+
{{hc|/etc/lightdm/lightdm.conf|
{{bc|/etc/lightdm/lightdm.conf}} <br>
+
greeter-session&#61;lightdm-kde-greeter
 +
}}
  
== Enabling Lightdm ==
+
== Enabling LightDM ==
=== Using Initscripts ===
+
Make sure that the '''lightdm''' daemon is [[Daemons#Managing_daemons|started]] at boot.
Lightdm can be loaded on startup by entering it in the daemons array in {{ic|rc.conf}}, or by modifying {{ic|inittab}} so it points to lightdm:
+
x:5:respawn:/usr/sbin/lightdm >& /dev/null
+
{{Note|The 'inittab' method is the preferred method to use a graphical greeter. See [[Display_Manager#inittab_method]].}}
+
  
{{Note|Lightdm needs [[dbus]] to be running.  If you get an error about "respawing too fast" you may have forgotten this.  Ensure that dbus is in your [[DAEMONS]] array in {{ic|rc.conf}}.}}
+
=== Testing ===
=== Using Systemd ===
+
First, [[Pacman|install]] {{Pkg|xorg-server-xephyr}} from the [[official repositories]].
For systems using systemd, Lightdm also has a systemd service file, start it with {{ic|systemctl start lightdm.service}} or enable it for boot with {{ic|systemctl enable lightdm.service}}.
+
  
See [[Display Manager]] for detailed instructions.
+
Then, run LightDM as an X application:
 +
$ lightdm --test-mode --debug
  
=== Testing ===
+
== Optional Configuration and Tweaks ==
Install xorg-server-xephyr:
+
Some greeters have their own configuration files. For example, {{Pkg|lightdm-gtk3-greeter}}  and {{Pkg|lightdm-gtk2-greeter}} have:
  pacman -S xorg-server-xephyr
+
  /etc/lightdm/lightdm-gtk-greeter.conf
Run lightdm as a X application:
+
and {{Pkg|lightdm-kde-greeter}} has:
  lightdm --test-mode --debug
+
/etc/lightdm/lightdm-kde-greeter.conf
 +
as well as a section in KDE's System Settings (recommended).
 +
 
 +
LightDM can be configured by directly modifying its configuration script or by using the {{ic|lightdm-set-defaults}} applications
 +
that can be found in {{ic|/usr/lib/lightdm/lightdm/}}. To see some of the options available, execute:
 +
  $ man lightdm-set-defaults
 +
 
 +
There are, however, a lot more variables to modify in the configuration file than by using the {{ic|lightdm-set-defaults}} application.
  
== Optional Configuration and Tweaks ==
 
 
=== Changing Background Images/Colors ===
 
=== Changing Background Images/Colors ===
 +
Users wishing to have a flat color (no image) may simply set the '''background''' variable to a hex color.
 +
 +
Example:
 +
background=#000000
 +
 +
If you want to use an image instead, see below.
 +
 +
==== GTK+ Greeter ====
 
Users wishing to customize the wallpaper on the greeter screen need to edit {{ic|/etc/lightdm/lightdm-gtk-greeter.conf}} defining the '''background''' variable.
 
Users wishing to customize the wallpaper on the greeter screen need to edit {{ic|/etc/lightdm/lightdm-gtk-greeter.conf}} defining the '''background''' variable.
  
Line 57: Line 78:
 
  background=/usr/share/pixmaps/black_and_white_photography-wallpaper-1920x1080.jpg
 
  background=/usr/share/pixmaps/black_and_white_photography-wallpaper-1920x1080.jpg
  
Users using the unity-greeter version must edit the {{ic|/usr/share/glib-2.0/schemas/com.canonical.unity-greeter.gschema.xml}} file
+
==== Unity Greeter ====
 
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Users using the {{AUR|lightdm-unity-greeter}} must edit the {{ic|/usr/share/glib-2.0/schemas/com.canonical.unity-greeter.gschema.xml}} file and then execute:
And then execute
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# glib-compile-schemas /usr/share/glib-2.0/schemas/
 
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{{ic|glib-compile-schemas /usr/share/glib-2.0/schemas/}}
+
  
 
According to [https://bbs.archlinux.org/viewtopic.php?id=149945 this] page.
 
According to [https://bbs.archlinux.org/viewtopic.php?id=149945 this] page.
  
 +
{{Note|It is recommended to place the PNG or JPG file in {{ic|/usr/share/pixmaps}} since the LightDM user needs read access to the wallpaper file.}}
  
 
+
==== KDE Greeter ====
{{Note|It is recommended to place png or jpg files in /usr/share/pixmaps since the lightdm user needs read access to the wallpaper file.}}
+
Go to ''System Settings > Login Screen (LightDM)'' and change the background image for your theme.
 
+
Users wishing to have a flat color (no image) may simply set the '''background''' variable to a hex color.
+
 
+
Example:
+
background=#000000
+
  
 
=== Changing the Icon ===
 
=== Changing the Icon ===
Line 81: Line 96:
  
 
==== Sources of Arch-centric 64x64 Icons ====
 
==== Sources of Arch-centric 64x64 Icons ====
The archlinux-artwork package in [extra] contains some nice examples that install to {{ic|/usr/share/archlinux/icons}} and that can be copied to {{ic|/usr/share/icons/hicolor/64x64/devices}} as follows:
+
The {{Pkg|archlinux-artwork}} package from the [[official repositories]] contains some nice examples that install to {{ic|/usr/share/archlinux/icons}} and that can be copied to {{ic|/usr/share/icons/hicolor/64x64/devices}} as follows:
 
+
 
  # find /usr/share/archlinux/icons -name "*64*" -exec cp {} /usr/share/icons/hicolor/64x64/devices \;
 
  # find /usr/share/archlinux/icons -name "*64*" -exec cp {} /usr/share/icons/hicolor/64x64/devices \;
  
After copying, the archlinux-artwork package can be removed.
+
After copying, the {{Pkg|archlinux-artwork}} package can be removed.
  
 
=== Enabling Autologin ===
 
=== Enabling Autologin ===
Edit {{ic|/etc/lightdm/lightdm.conf}} and change these lines to:
+
Edit the LightDM configuration file and change these lines to:
 
+
{{hc|/etc/lightdm/lightdm.conf|<nowiki>
[SeatDefaults]
+
[SeatDefaults]
autologin-user=your_user
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autologin-user=USERNAME
autologin-user-timeout=0
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autologin-user-timeout=0
pam-service=lightdm-autologin
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pam-service=lightdm-autologin</nowiki>
 +
}}
 +
or execute:
 +
# /usr/lib/lightdm/lightdm/lightdm-set-defaults --autologin=USERNAME
  
 
==== PAM settings ====
 
==== PAM settings ====
 +
{{Note|These steps may no longer be necessary.}}
  
Lightdm goes through PAM even when autologin is enabled. You must make sure that
+
LightDM goes through PAM even when ''autologin'' is enabled. You must make sure that PAM allows login without prompting for a password.
PAM allows the login without prompting for a password.
+
  
 
Create a new group called, say, {{ic|autologin}} and add yourself to the group:
 
Create a new group called, say, {{ic|autologin}} and add yourself to the group:
Line 109: Line 126:
 
   auth optional pam_permit.so
 
   auth optional pam_permit.so
  
This ensures that the user will not be asked for a password when logging in through Lightdm autologin.
+
This ensures that the user will not be asked for a password when logging in through LightDM's autologin.
 
So any user you would like to login without typing password in LightDM just add to this group.
 
So any user you would like to login without typing password in LightDM just add to this group.
  
Line 117: Line 134:
  
 
=== User switching under xfce4 ===
 
=== User switching under xfce4 ===
With the release of xfce4 v4.10, user switching is supported natively. To use it with lightdm, users need only to create a symlink:
+
With the release of Xfce4 4.10, user switching is supported natively. To use it with LightDM, users need only to create a symlink:
 
+
 
  # ln -s /usr/lib/lightdm/lightdm/gdmflexiserver /usr/bin/gdmflexiserver
 
  # ln -s /usr/lib/lightdm/lightdm/gdmflexiserver /usr/bin/gdmflexiserver
  
 
Alternatively, see the [[XScreenSaver#Lightdm]] article.
 
Alternatively, see the [[XScreenSaver#Lightdm]] article.
 +
 +
== See Also ==
 +
* [https://wiki.ubuntu.com/LightDM Ubuntu Wiki article]
 +
* [http://wiki.gentoo.org/wiki/LightDM Gentoo Wiki article]
 +
* [https://launchpad.net/lightdm Launchpad Page]
 +
* [http://www.mattfischer.com/blog/?tag=lightdm LightDM blog]

Revision as of 23:16, 14 March 2013

Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki Template:Article summary wiki Template:Article summary wiki Template:Article summary wiki Template:Article summary end

LightDM is a cross-desktop display manager that aims to be the standard display manager for the X server. Its key features are:

  • A lightweight codebase
  • Standards compliant (PAM, ConsoleKit, etc)
  • A well defined interface between the server and the user interface.
  • Cross-desktop (user interfaces can be written in any toolkit).

More details about LightDM's design can be found here.

Installation

Install lightdm from the official repositories or lightdm-bzrAUR from the AUR.

Greeter

You will also need to install a greeter (a user interface for LightDM). The reference greeter is lightdm-gtk-greeter, which is provided by either lightdm-gtk3-greeter or lightdm-gtk2-greeter. KDE users can install lightdm-kde-greeter, a greeter based on Qt.

Other greeters can be installed from the AUR as well:

You can change the default greeter at compile time by changing the line containing:

--with-greeter-session=lightdm-gtk-greeter

to

--with-greeter-session=lightdm-yourgreeter-greeter

Or, more easily, change the configuration file to state:

/etc/lightdm/lightdm.conf
greeter-session=lightdm-kde-greeter

Enabling LightDM

Make sure that the lightdm daemon is started at boot.

Testing

First, install xorg-server-xephyr from the official repositories.

Then, run LightDM as an X application:

$ lightdm --test-mode --debug

Optional Configuration and Tweaks

Some greeters have their own configuration files. For example, lightdm-gtk3-greeter and lightdm-gtk2-greeter have:

/etc/lightdm/lightdm-gtk-greeter.conf

and lightdm-kde-greeter has:

/etc/lightdm/lightdm-kde-greeter.conf

as well as a section in KDE's System Settings (recommended).

LightDM can be configured by directly modifying its configuration script or by using the lightdm-set-defaults applications that can be found in /usr/lib/lightdm/lightdm/. To see some of the options available, execute:

$ man lightdm-set-defaults

There are, however, a lot more variables to modify in the configuration file than by using the lightdm-set-defaults application.

Changing Background Images/Colors

Users wishing to have a flat color (no image) may simply set the background variable to a hex color.

Example:

background=#000000

If you want to use an image instead, see below.

GTK+ Greeter

Users wishing to customize the wallpaper on the greeter screen need to edit /etc/lightdm/lightdm-gtk-greeter.conf defining the background variable.

Example:

background=/usr/share/pixmaps/black_and_white_photography-wallpaper-1920x1080.jpg

Unity Greeter

Users using the lightdm-unity-greeterAUR must edit the /usr/share/glib-2.0/schemas/com.canonical.unity-greeter.gschema.xml file and then execute:

# glib-compile-schemas /usr/share/glib-2.0/schemas/

According to this page.

Note: It is recommended to place the PNG or JPG file in /usr/share/pixmaps since the LightDM user needs read access to the wallpaper file.

KDE Greeter

Go to System Settings > Login Screen (LightDM) and change the background image for your theme.

Changing the Icon

Users wishing to customize the icon on the greeter screen need to edit /etc/lightdm/lightdm-gtk-greeter.conf defining the logo variable.

Example:

logo=/usr/share/icons/hicolor/64x64/devices/archlinux-icon-crystal-64.svg

Sources of Arch-centric 64x64 Icons

The archlinux-artwork package from the official repositories contains some nice examples that install to /usr/share/archlinux/icons and that can be copied to /usr/share/icons/hicolor/64x64/devices as follows:

# find /usr/share/archlinux/icons -name "*64*" -exec cp {} /usr/share/icons/hicolor/64x64/devices \;

After copying, the archlinux-artwork package can be removed.

Enabling Autologin

Edit the LightDM configuration file and change these lines to:

/etc/lightdm/lightdm.conf
[SeatDefaults]
autologin-user=USERNAME
autologin-user-timeout=0
pam-service=lightdm-autologin

or execute:

# /usr/lib/lightdm/lightdm/lightdm-set-defaults --autologin=USERNAME

PAM settings

Note: These steps may no longer be necessary.

LightDM goes through PAM even when autologin is enabled. You must make sure that PAM allows login without prompting for a password.

Create a new group called, say, autologin and add yourself to the group:

 groupadd autologin
 gpasswd -a username autologin

Edit /etc/pam.d/lightdm and locate the line "auth required pam_unix.so". Add new lines before and after it so that the section now reads:

 auth [success=1 default=ignore] pam_succeed_if.so user ingroup autologin
 auth required pam_unix.so
 auth optional pam_permit.so

This ensures that the user will not be asked for a password when logging in through LightDM's autologin. So any user you would like to login without typing password in LightDM just add to this group.

NumLock ON

Install the numlockx package and the edit /etc/lightdm/lightdm.conf adding the following line:

greeter-setup-script=/usr/bin/numlockx on

User switching under xfce4

With the release of Xfce4 4.10, user switching is supported natively. To use it with LightDM, users need only to create a symlink:

# ln -s /usr/lib/lightdm/lightdm/gdmflexiserver /usr/bin/gdmflexiserver

Alternatively, see the XScreenSaver#Lightdm article.

See Also