https://bugs.freedesktop.org/show_bug.cgi?id=88877
--- Comment #5 from Alex Deucher alexdeucher@gmail.com --- (In reply to darkbasic from comment #4)
Oh this is important: I forgot to say I'm using DRI3 with this xf86-video-ati branch: https://github.com/iXit/xf86-video-ati/commits/master
Does removing that patch fix the issue?