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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.