https://bugs.freedesktop.org/show_bug.cgi?id=66963
--- Comment #114 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #107)
I'm also having the issue on a 3870/RV670 using Sept4 drm-next (d30645ae from Ubuntu's mainline builds) and previous builds.
What sort of issue are you having? blank screen? currupt image? GPU hang?