https://bugs.freedesktop.org/show_bug.cgi?id=73420
--- Comment #17 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #16)
Yes, that patch worked, no more messages. I still get no accel though ("RADEON(0): GPU accel disabled or not working, using shadowfb for KMS"), but I guess I need to investigate that further first - unless you have a quick idea ?
Acceleration is currently disabled by default on hawaii as it's unstable for a lot of apps. You can force it on with Option "NoAccel" "false" in the device section of your xorg conf, but you'll see gpu hangs.