https://bugs.freedesktop.org/show_bug.cgi?id=66963
--- Comment #222 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #221)
Mesa and dpm are unrelated. This bug is about dpm stability on rv6xx asics regardless of what version of the userspace drivers you are using.
So what is DPM dependant on/part of? xf86-video-ati?
It's part of the radeon kernel driver. It doesn't matter what userspace drivers (mesa, xf86-video-ati) you use.