Inhibit screen blanking / automatic suspend when playing
When playing, the sleep settings of the OS should be blocked (when playing with keyboard, this probably never happens, but with a gamepad, it did. And my wine on the couch in the heat in the moment will remind us of this for a long time! :P).
It should probably not be inhibited just by the game being on, even when in full screen (actually full-screen or not should not matter). In particular, when in the menu, or in pause mode, I'd say that the display should be allowed to switch itself off, and the OS to go to sleep. But when playing, none of this should happen.