https://bugs.freedesktop.org/show_bug.cgi?id=85107

--- Comment #14 from Alex Deucher agd5f@yahoo.com --- Created attachment 108473 --> https://bugs.freedesktop.org/attachment.cgi?id=108473&action=edit dpm fix

(In reply to Marcel Witte from comment #13)

Thanks for the patch. I still need radeon.bapm=0 to boot properly, but with setting

pi->enable_nb_dpm = false;

the clock is getting higher and so I have the full performance. Finally I can watch HD videos with VDPAU now :)

Great. The attached patch should allow your system to work out of the box.

I run this tests using kernel 3.18-rc1. I do not have looked at the code further, that is the consequence of this setting? Could there be any matching BIOS setting? How can I further debug why my system is needing this change?

nb dpm is northbridge dpm. You might check and see if there are any bios options related to the northbridge that workaround the issue.