Created attachment 108473 [details] [review]
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.