Difference between revisions of "LightDM"

Revision as of 21:32, 28 January 2014

zh-CN: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, logind, 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. You can also install lightdm-devel^AUR for the development branch or lightdm-bzr^AUR 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 lightdm-gtk2-greeter or lightdm-gtk3-greeter. KDE users can install lightdm-kde-greeter, a greeter based on Qt.

Other greeters can be installed from the AUR as well:

• lightdm-another-gtk-greeter^AUR: A GTK3 greeter with custom theme support
• lightdm-webkit-greeter^AUR: A greeter that uses Webkit for theming.
• lightdm-crowd-greeter^AUR: A 3D greeter that lets you select your profile from 3D characters walking around.
• lightdm-unity-greeter^AUR: The greeter used by Ubuntu's Unity.
• lightdm-razor-greeter^AUR: A greeter for the Razor-qt desktop environment.
• lightdm-pantheon-greeter^AUR: A greeter from the ElementaryOS Project.

You can change the default greeter by changing the configuration file to state:

/etc/lightdm/lightdm.conf

greeter-session=lightdm-yourgreeter-greeter

Enabling LightDM

Make sure to enable the lightdm daemon using systemctl so it will be started at boot.

Command line tool

LightDM offers a command line tool, dm-tool, which can be used to lock the current seat, switch sessions, etc, which is useful with 'minimalist' window managers and for testing. To see a list of available commands, execute:

$ dm-tool --help

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-gtk2-greeter and lightdm-gtk3-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-greeter^AUR 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.

KDE Greeter

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

Changing your avatar

The .face way

Users wishing to customize their image on the greeter screen need to place an PNG image called .face or .face.icon in their home directory. Make sure it can be read by LightDM.

The AccountsService way

The .face way is known to cause issues, fortunately LightDM is able to automatically use AccountsService if it is installed. AccountsService files need to be set up as follows:

• A user file named after your user in /var/lib/AccountsService/users/johndoe containing:

[User]
Icon=/var/lib/AccountsService/icons/johndoe

• A 96x96 PNG icon file in /var/lib/AccountsService/icons/johndoe

Sources of Arch-centric 64x64 Icons

The archlinux-artwork^AUR package from the AUR 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^AUR package can be removed.

Enabling Autologin

Edit the LightDM configuration file and change these lines to:

/etc/lightdm/lightdm.conf

autologin-user=USERNAME
autologin-user-timeout=0

or execute:

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

LightDM goes through PAM even when autologin is enabled. You must be part of the autologin group to be able to login without entering your password:

# groupadd autologin
# gpasswd -a USERNAME autologin

Hiding system and services users

To prevent system users from showing-up in the login, install the optional dependency accountsservice, or add the user names to /etc/lightdm/users.conf under hidden-users. The first option has the advantage of not needing to updated the list when more users are added or removed.

Migrating from SLiM

Move the contents of xinitrc to xprofile, removing the call to start the window manager or desktop environment.

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

LightDM supports user switching under a number of different desktop environments. To enable user switching it is necessary to create a symlink:

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

For an alternative method see the XScreenSaver#Lightdm article.

Default Session

Lightdm, like other DMs, stores the last-selected xsession in ~/.dmrc. See Display_Manager#Session_list for more info.

Troubleshooting

If you encounter consistent screen flashing and ultimately no lightdm on boot, ensure that you have defined the greeter correctly in lightdm's config file. And if you have correctly defined the GTK greeter, make sure the xsessions-directory (default: /usr/share/xsessions) exists and contains at least one .desktop file.

Power menu (restart, poweroff etc.) not available

If you have installed lightdm before lightdm-1:1.6.0-6, you might have been struck by this bug: FS#36613, to fix it run:

# chown polkitd:root /usr/share/polkit-1/rules.d

Wrong locale displayed

In case of your locale not being displayed correctly in Lightdm add your locale to /etc/environment

 LANG=pt_PT.utf8

Xresources not being parsed correctly

LightDM has an upstream bug where your Xresources file will not be loaded with a pre-processor. In practical terms, this means that variables set with #define are not expanded when called later. You may see this reflected as an all-pink screen if using a custom color set with urxvt. To fix it, edit /etc/lightdm/Xsession and search for the line:

xrdb -nocpp -merge "$file"

Change it to read:

xrdb -merge "$file"

Your Xresources will now be pre-processed so that variables are correctly expanded.

Missing icons with GTK greeter

If you're using lightdm-gtk2-greeter as a greeter and it shows placeholder images as icons, make sure valids icon theme and theme are configured. Check the following file:

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

[greeter]
theme-name=mate      # this should be the name of a directory under /usr/share/themes/
icon-theme-name=mate # this should be the name of a fully featured icons set directory under /usr/share/icons/

See Also

• Ubuntu Wiki article
• Gentoo Wiki article
• Launchpad Page
• LightDM blog