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增加 GDM 说明. 

Signed-off-by: lion.chan <cy187lion@sina.com>
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lion.chan 2021-02-12 13:07:44 +08:00
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# GDM
From GDM - GNOME Display Manager: "The GNOME Display Manager (GDM) is a program that manages graphical display servers and handles graphical user logins."
Display managers provide X Window System and Wayland users with a graphical login prompt.
## 1.GDM auto-suspend (GNOME 3.28)
GDM uses a separate dconf database to control power management. To apply your user's power settings, copy them to GDM's dconf database:
```bash
IFS=$'\n'; for x in $(sudo -u username gsettings list-recursively org.gnome.settings-daemon.plugins.power); do eval "sudo -u gdm dbus-launch gsettings set $x"; done; unset IFS
```
where username is your username.
To only disable auto-suspend on AC, run:
```bash
sudo -u gdm dbus-launch gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type 'nothing'
```
(To also disable auto-suspend on battery, run the command with battery instead of ac.)
Restart GDM to activate your changes.