At some point Suspend when inactive stopped working on my system.
It used to work, but now regardless whether I set it via System Settings or
sleep-inactive-ac-timeout goes back to 0 after several seconds.
dconf watch / shows after I set it to 5 min:
300 and then:
0 It seems that some daemon is setting it back, but I cannot figure out how to resolve it.
Using classic GNOME on Ubuntu 14.04 (if makes a difference).