On 4.15-wip with patches that make powerplay work I have an issue with one game = unreal tournament alpha. This doesn't seem to affect other things like xonotic or unigine demos. Issue = on fixes 4.14 and other older kernels I've tried, the game is OK ish perf wise, 20-40 fps. On 4.15-wip its 10fps. Using HUD one obvious difference is that the slow case is only mostly using one cpu core, on a good kernel all 4 of my old phenom 2 x4 are used. Both kernels seem based on 4.13-rc5 so I guess it's something amdgpu. Trouble is, I can't bisect 4.15-wip, going back near or > 200 commits I lock soon after startx. So is there any change devs can think of that would cause this?
