I'm using the first, accepted answer to this question to have Steam as an Environment on Login.
Steam itself works fine, but when I attempt to start a game, the screen turns black and I have to restart LightDM service to be able to login again...
How do I launch a game when there's no Desktop Environment running, just LightDM and Steam in BigPicture mode?
I've tried to start DotA2 and Super Hexagon, but both times the screen turns black.