Bug#896083: gdm3: Suspends machine after 20 minutes

[Xavier Bestel]

FWIW I tried:

	dbus-launch gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type 'nothing'

as root, but my machine is still suspending with this message:

	Broadcast message from Debian-gdm at inuc on tty1 (Thu 2022-09-01 10:34:51 CEST):

	The system is going down for suspend NOW!

... which is very inconvenient (this is a freshly installed mostly
headless machine).