https://bugs.freedesktop.org/show_bug.cgi?id=66963
--- Comment #107 from Bryan Quigley gquigs+bugs@gmail.com --- Created attachment 85216 --> https://bugs.freedesktop.org/attachment.cgi?id=85216&action=edit 3870/RV670 - dmesg manually loading radeon
I'm also having the issue on a 3870/RV670 using Sept4 drm-next (d30645ae from Ubuntu's mainline builds) and previous builds.
Disabling radeon.aspm=0 also didn't help. My machine is accessible via SSH so I can do further debugging.