Fullscreen bug still exists in 5.0-3 [steam-511680.log](https://github.com/ValveSoftware/Proton/files/4265151/steam-511680.log) Not sure if this is KDE's doing, but launching the game always makes the motherboard's PC sp...
Fullscreen bug still exists as of Proton 4.11-12. Since the initial report, I've upgraded my system ([see gist](https://gist.github.com/archaeme/9e84659c7fcff58bc4126f12f2e4993e)). Here's a log when enabling full screen ...
Ok, I think I may have discovered one bug. Setting full screen in the options instead opens up a window that's the size of the screen. Haven't seen if this behaviour exists in Windows yet.