Bug#893964: gdm3: System goes into suspend mode unless a user is logged in on the console.

[Simon McVittie]

On Sat, 24 Mar 2018 at 15:23:28 +0000, Russel Winder wrote:
> With the update to 3.28 a newly rebooted machine that starts GDM will suspend after about 15 mins unless a
> user logs in to the console.

It's 20 minutes, and is a result of the defaults in gnome-settings-daemon
3.28 changing to comply with European and American power-saving
regulations.

> there appears to be no way of switching the GDM suspend behaviour off

There's currently no UI for it, but if you append this to
/etc/gdm3/greeter.dconf-defaults:

[org/gnome/settings-daemon/plugins/power]
sleep-inactive-ac-timeout=0
sleep-inactive-battery-timeout=0

then reboot (or run "service gdm3 reload" as root), that should put the
GDM session back to the pre-3.28 behaviour. The values are in seconds,
with 0 meaning never; please adjust as needed.

    smcv