https://bugs.freedesktop.org/show_bug.cgi?id=66963
--- Comment #270 from Michel Dänzer michel@daenzer.net --- Kajzer, I don't think this has anything to do with the original problem reported here anymore but should be tracked in a separate report.
(In reply to Kajzer from comment #269)
# first bad commit: [02376d8282b88f07d0716da6155094c8760b1a13] drm/radeon: Allow write-combined CPU mappings of BOs in GTT (v2)
commit 02376d8282b88f07d0716da6155094c8760b1a13 Author: Michel Dänzer michel.daenzer@amd.com Date: Thu Jul 17 19:01:08 2014 +0900
drm/radeon: Allow write-combined CPU mappings of BOs in GTT (v2)
Are you 100% (or at least 99.99...% :) sure that the problem doesn't happen without this commit?