I've found an incantation that gives me better FPS in all games (that I've tried so far):
mesa_glthread=true R600_DEBUG=sbcl,hyperz,llvm,sisched,forcedma %command%
What I'd like to do is set this as a
launch option for every game. It's a pain setting it for each game , I have 45, shared across 3 family members - potentially 135 settings. If I want to change all the settings because I find a better launch option (or change my graphics card, say) then I'll need to redo them all.
So, is it possible to make Steam use the same launch options for all games in my library?
I'm on Kubuntu 17.10 using a Kaveri AMDGPU, fwiw.
 - find game in library, right-click, choose properties, choose "set launch options", paste in options code, OK, OK.