I can't seem to play Grim Dawn (only game I'm currently playing) in full screen: even though it's in full screen selected inside the game, it's in a window. It's problem because it cuts part of the image: from both bottom as well as right side.
Here's a screenshot with the problem:
as can be seen, it cuts part of the bottom as well as a sizeable chunk from the right size.
Here's a pic taken from the net of this screen,
so that you can see how much is being cut off.
The workaround is to select the 2nd highest resolution. it works because I can see the whole picture but that's because, even though it's supposed to be in full screen, it's actually on a window. That's not full screen at all.
I have less then 2 months experience using Linux and I chose Ubuntu 16.04. please keep that in mind when posting solutions to this problem because I may not know how to implement them.