LightDM

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LightDM é um display manager multiplataformas cujo objetivo é ser o display manager padrão para o X server.

As características-chave (conforme listadas pelo upstream) incluem:

Uma API de saudação bem definida permitindo diversas GUIs
Suporte para todos os casos de uso para display manager, com plugins se necessário
Baixa complexidade de código
Desempenho rápido

Instalação

USE flags

USE flags for x11-misc/lightdm A lightweight display manager

+gnome Add GNOME support

+gtk Pull in the gtk+ greeter

+introspection Add support for GObject based introspection

X Add support for X11

audit Enable support for Linux audit subsystem using sys-process/audit

elogind Enable session tracking via sys-auth/elogind

non-root Use non-root user by default

systemd Enable use of systemd-specific libraries and features like socket activation or session tracking

vala Enable bindings for dev-lang/vala

Data provided by the Gentoo Package Database · Last update: 2025年10月26日 03:26 More information about USE flags

Emerge

Instalar o lightdm:

root #emerge --ask x11-misc/lightdm

Configuração

O arquivo de configuração (global) para o LightDM pode ser encontrado em:

FILE /etc/lightdm/lightdm.conf

[Seat:*]
...
session-wrapper=/etc/lightdm/Xsession
...

GTK+

The greeter allows to select logging into one of of the installed type of sessions through the icon in the Panel on top of the display. This makes it unnecessary to configure the session startup through user profile configurations. For example, xfce-base/xfce4-session installs /usr/share/xsessions/xfce.desktop which enables the greeter to offer the Xfce session. The default is an Xsession which relies on user profile files.

The GTK greeter configuration can be modified by manually editing the following file:

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

RazorQt

Currently Gentoo does not support the Qt greeter since it was moved out into it's own project at https://github.com/surlykke/qt-lightdm-greeter however USE flag support is in the x11-misc/lightdm package if someone wanted to add the greeter support.

Boot service

OpenRC

With display-manager

root #emerge --ask gui-libs/display-manager-init

Set LightDM as the default display manager:

FILE /etc/conf.d/display-manager

DISPLAYMANAGER="lightdm"

To start LightDM on boot, add dbus and display-manager to the default runlevel. dbus is necessary because LightDM depends on it to pass messages:

root #

rc-update add dbus default

root #rc-update add display-manager default

To start LightDM now:

root #

rc-service dbus start

root #rc-service display-manager start

With the deprecated xdm init script

Defina o LightDM como o display manager padrão:

FILE /etc/conf.d/xdm

DISPLAYMANAGER="lightdm"

Para iniciar o LightDM no boot, adicione o dbus e o xdm ao runlevel default:

root #rc-update add dbus default

root #rc-update add xdm default

Para iniciar o LightDM agora:

root #/etc/init.d/dbus start

root #/etc/init.d/xdm start

systemd

Para iniciar o LightDM no boot:

root #systemctl enable lightdm

Para iniciar o LightDM agora:

root #systemctl start lightdm

Ferramenta de linha de comando

LightDM inclui uma ferramente de linha de comando, dm-tool, que pode ser usada para alternar as sessões de usuário, fixar o estado atual, etc. Para ver uma lista de comandos disponíveis, use a opção --help:

user $dm-tool --help

Por exemplo, para fixar o estado atual:

user $dm-tool lock

Tips

Running commands at log-in

A user can run some programs automatically when logging in using LightDM by adding commands in ~/.xprofile, which will be sourced by LightDM. For example:

FILE ~/.xprofile

# Starting redshift, setting the dpi with xrandr and set the brightness to 50% with xbacklight
xrandr--dpi192&
redshift-gtk&
xbacklight-set50&

Unlock GNOME Keyring

To unlock your GNOME Keyring (gnome-base/gnome-keyring ) automatically on login, edit /etc/pam.d/lightdm to look as follows. Note: Lines ending with the comment #keyring should be added.

FILE /etc/pam.d/lightdm

auth substack system-local-login
auth optional pam_gnome_keyring.so #keyring
account substack system-local-login
password substack system-local-login
session substack system-local-login
session optional pam_gnome_keyring.so auto_start #keyring

Locking the screen with elogind after suspend or sleep

For security, it is good practice to lock the screen after elogind triggers suspend or sleep. This can be done easily by doing the following:

Install light-locker:

root #emerge --ask x11-misc/light-locker

Start light-locker after the X server has started by putting light-locker & into either an ~/.xprofile or ~/.xinitrc file.

FILE ~/.xprofile

# Starting light-lock with X session
light-locker&

Create a lock.sh file under /lib64/elogind/system-sleep/ (be sure to add execute permissions to the file):

root #chmod +x /lib64/elogind/system-sleep/lock.sh

Resolução de problemas

LightDM crashes upon first login if hostname changes during login

In some cases LightDM may crash when trying to log in for the first time if the hostname changes in the time between the boot and login (launchpad bug #1677058).

This may be encountered if net-misc/networkmanager is using the default settings to obtain the hostname from DHCP server and the hostname differs from the default one set on boot.

To disable NetworkManager hostname setting behavior, set the following line in [main] section of /etc/NetworkManager/NetworkManager.conf:

FILE /etc/NetworkManager/NetworkManager.conf

[main]
...
hostname-mode=none
...

LightDM fails to launch with Nvidia GPU

Users with Nvidia GPUs may encounter failures when using LightDM (GitHub issue #263).

A workaround for this issue involves editing /etc/lightdm/lightdm.conf and adding the line logind-check-graphical=false within the [LightDM] section.