https://bugs.freedesktop.org/show_bug.cgi?id=62959
--- Comment #23 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #22)
It seems running kernel 3.9-rc6 with attachment 72794 [details] [review] with latest mesa (UMAD fixed on Cayman, thanks to commit pushed by Marek) allowed me to run all r600 piglit tests without any issue.
Great. I'll add that patch to my queue and also a similar patch for SI.