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

audit	Enable support for Linux audit subsystem using sys-process/audit
elogind	Enable session tracking via sys-auth/elogind
gnome	Add GNOME support
gtk	Pull in the gtk+ greeter
introspection	Add support for GObject based introspection
non-root	Use non-root user by default
qt5	Add support for the Qt 5 application and UI framework
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: 2023-05-09 13:36 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:

GTK+

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

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

RazorQt

A tela de saudação do RazorQT atualmente não oferece nenhuma opção de configuração.

Boot service

OpenRC

With display-manager

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 --dpi 192 &
redshift-gtk &
xbacklight -set 50 &

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 Xorg with a Nvidia GPU

Nvidia GPU users may experience LightDM failures in terms of launching Xorg (GitHub issue #263 ).

A workaround for this bug would be to edit /etc/lightdm/lightdm.conf to include the line logind-check-graphical=false in the [LightDM] section.

FILE /etc/lightdm/lightdm.conf

[LightDM]
...
logind-check-graphical=false
...

See also

• SDDM — a modern display manager that supports both the X server and the Wayland protocol.