Bug#893574: Auto-suspend

[floris]

I found that gsd-power only monitors his/her seat. The suspend settings 
in 'gnome-control-center power' do work. When a user has set automatic 
suspend to on, the computer will suspend even there is an active user on 
an other seat. As a workaround I can disable the automatic suspend for 
all users, but where can I change the suspend settings for Gdm3?