https://bugs.freedesktop.org/show_bug.cgi?id=76490
--- Comment #106 from samdenies@zhentarim.net --- (In reply to Alex Deucher from comment #105)
Does this attached patch help?
I was not able to apply the patch itself as it didn't match the source for 4.5.1 that I downloaded. However, adding the line manually did fix my problem. I am able to boot without radeon.dpm=0 and have good 3d performance. Thanks!