LightDM

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LightDM is a cross-desktop display manager whose aim is to be the standard display manager for the X server.

The key features (as listed by upstream) are:

  • A well-defined greeter API allowing multiple GUIs
  • Support for all display manager use cases, with plugins where appropriate
  • Low code complexity
  • Fast performance

Installation

Install x11-misc/lightdm:


USE flag (what is that?) Default Recommended Description
gtk Yes Pull in the gtk+ greeter
introspection Yes Use dev-libs/gobject-introspection for introspection
kde No Pull in the kde greeter
qt4 Yes Add support for the Qt GUI/Application Toolkit version 4.x
razor No Pull in the razorqt greeter
root #emerge --ask lightdm

Configuration

The configuration file for LightDM itself is: /etc/lightdm/lightdm.conf

GTK+

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

KDE

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

The LightDM KDE greeter also provides a KCM (KDE Control Module), which appears in the System Settings under System AdministrationLogin Screen (LightDM).

Due to LightDM currently assuming GTK+ greeter as the default, if the KDE greeter is requested, it needs to be specified in the /etc/lightdm/lightdm.conf file:

FILE /etc/lightdm/lightdm.conf
[SeatDefaults]greeter-session=lightdm-kde-greeter

RazorQt

The RazorQt greeter currently does not offer any configuration options.

Boot service

OpenRC

Set LightDM as the default display manager:

FILE /etc/conf.d/xdm
DISPLAYMANAGER="lightdm"

To start LightDM on boot, add dbus & xdm to the default runlevel:

root #rc-update add dbus default
root #rc-update add xdm default

To start LightDM now:

root #/etc/init.d/dbus start
root #/etc/init.d/xdm start

systemd

To start LightDM on boot:

root #systemctl enable lightdm

To start LightDM now:

root #systemctl start lightdm

Troubleshooting

Cursor themes not working

As of March 28, 2015, the stable versions of lightdm (lightdm-1.10.3) and lightdm-gtk-greeter (lightdm-gtk-greeter-1.7.0) have a bug that affects some DEs such as XFCE with setting the mouse cursor. Applications will apply the new mouse theme, but the root window where the window manager draws on does not. To get around this, simply unmask the latest versions (lightdm-1.13.2 and lightdm-gtk-greeter-2.0.0 at the time of writing) and the cursors will be set correctly.

More information can be found in Ubuntu's bug #1024482.