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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - kernel-3.11 [drm:r600_uvd_ring_test] *ERROR* radeon: ring 5 test failed (0xCAFEDEAD)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67276#c16">Comment # 16</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - kernel-3.11 [drm:r600_uvd_ring_test] *ERROR* radeon: ring 5 test failed (0xCAFEDEAD)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67276">bug 67276</a>
from <span class="vcard"><a class="email" href="mailto:agd5f@yahoo.com" title="Alex Deucher <agd5f@yahoo.com>"> <span class="fn">Alex Deucher</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=67276#c15">comment #15</a>)
<span class="quote">> 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.</span >
Memory is never explicitly cleared.
<span class="quote">>
> Maybe I have a similar problem here: The faulty register isn't rewritten on
> every reboot???</span >
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.</pre>
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