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

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67276

--- Comment #17 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #16)
> (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.

Unless there is a specific reason to.  Otherwise it just adds extra overhead.

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