Quoting: kaimanI'm on Gnome, but I could swear that this also is a problem I had in the past. Haven't played many games with controller lately, so no idea if it's still an issue or not.

But even then it annoys me at times: screen going blank during lengthy cut-scenes. Or the opposite: screen not going blank when Firefox with Youtube is open, and no video playing (happens only on occasion, though).

On my system with Archlinux + GNOME, if you are playing with the controller the screen doesn't go blank. If you don't touch the controller, a lengthy cut-scene as you say, the screen goes blank and you have to touch the mouse or keyboard (the controller don't work¿?). I have my power saving config to go blank after 5 min of inactivity so it's not a problem anymore for me.

And that applies on steam, emulators etc.