[Bug 67276] kernel-3.11 [drm:r600_uvd_ring_test] *ERROR* radeon: ring 5 test failed (0xCAFEDEAD)

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Comment # 16 on bug 67276 from
(In reply to comment #15)
> Do you have any idea, why this happens randomly on cold boots but not when
> restarting the pc? I think the whole initialization process should be the
> same everytime the system is booted, so that the ring initialization should
> fail every time.
> 
> On I side note: Earlier I had an interesting problem. When rebooting the pc
> after a drm-lockup I could see the last screen before the restart. This
> means that some memory buffers were not completely cleared during the
> reboots.

Memory is never explicitly cleared.

> 
> Maybe I have a similar problem here: The faulty register isn't rewritten on
> every reboot???

The only way to figure out what is going on is to bisect.  There are a lot of
things that could cause ring tests to fail.


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