[Bug 91371] UVD not responding error during UVD initialization for AMD 7670M graphics

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https://bugzilla.kernel.org/show_bug.cgi?id=91371

--- Comment #5 from Adis Hamzić <adis@xxxxxxxxxxxx> ---

I just tested the kernels 3.14.27 and 3.16.7.3 and they both display the issue. 

Now, I had used the 3.14.27 kernel for at least 10 days and I never noticed
this issue. In that time I was doing some kernel debugging which involved a
great number of cold and hard reboots so I think I would have noticed the issue
if it had been there. I'll test some older kernels soon.

What I found out during my testing was:
 * Setting radeon.dpm=0 fixes the issue.
 * Doing a hard reboot / poweroff has a very high chance of triggering the
problem, in fact I managed to reproduce it 10 consecutive times.
 * Doing a soft reboot has very little chance of triggering the problem. With
this I managed to have 10 consecutive successful boots.

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