Yey, seems to be solved! Seems to be solved for another user on the Phoronix forums also: http://openbenchmarking.org/result/1511262-HA-1510216HA93 http://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/open-source-amd-linux/834606-amd-tonga-fiji-open-source-performance-boosted-by-powerplay-patches/page6 After my latest pull of agd5f/amdgpu-powerplay I now get > 100 FPS in Unigine Heaven, the mouse cursor doesn't freeze when I start Steam etc. So it's one of the new commits on drm-next-4.5-wip I guess.