LightDM

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LightDM은 X 서버용 표준 디스플레이 관리자를 겨냥한 교차 데스크톱 디스플레이 관리자입니다.

(업스트림에서 언급한) 핵심 기능은:

  • 다중 GUI를 서용하는 잘 정의된 글리터 API
  • 모든 디스플레이 관리자 사용 사례, 적재 적소의 플러그인을 지원
  • 코드의 복잡성 경감
  • 빠른 속도

설치

USE 플래그

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

lightdm을 설치합니다:

root #emerge --ask x11-misc/lightdm

설정

LightDM의 (전역) 설정 파일은 다음 위치에서 찾을 수 있습니다:

파일 /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.

부트 서비스

OpenRC

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

Set LightDM as the default display manager:

파일 /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

LightDM을 기본 디스플레이 관리자로 설정하십시오:

파일 {{{filename}}}
DISPLAYMANAGER="lightdm"

LightDM을 부팅할 때 시작하려면, 기본 런레벨에 dbus와 xdm을 추가하십시오:

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

이제 LightDM을 시작하십시오:

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

systemd

부팅시 LightDM을 시작하려면:

root #systemctl enable lightdm

이제 LightDM을 시작하십시오:

root #systemctl start lightdm

명령행 도구

LightDM에는 사용자 세션을 전환하고, 현재 시트를 잠그는 등의 가능을 수행하는 명령행 도구 dm-tool이 있습니다. 사용 가능한 명령 목록을 보려면 --help 옵션을 사용하십시오:

user $dm-tool --help

예를 들어 현재 시트를 잠그려면:

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:

파일 ~/.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.

파일 /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.

파일 ~/.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

문제 해결

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:

파일 /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.

파일 /etc/lightdm/lightdm.conf
[LightDM]
...
logind-check-graphical=false
...

See also