https://bugs.freedesktop.org/show_bug.cgi?id=58354
--- Comment #16 from Alex Deucher agd5f@yahoo.com --- Does a 3.8 kernel it work ok if you revert mesa back to cf5632094ba0c19d570ea47025cf6da75ef8457a?
I think r600g: rework flusing and synchronization pattern v7 http://cgit.freedesktop.org/mesa/mesa/commit/?id=24b1206ab2dcd506aaac3ef656a... may be problematic on cayman.