[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 #14 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #13)
> 
> I cannot forcibly trigger the problem. That's why I'm hoping for more
> detailed debug messages. Maybe something connected with ring-testing or
> maybe data feeding for those rings or anything that hs to do with the ring.
> 
> I'm also wondering why the problem don't appear when I restart the pc? Is it
> some kind of a racing condition? How can I get the info that's in the ring
> at the time the error occurs? How is the ring testing done?

I'm not sure.  I've never seen the problem.  It could be a problem with another
one of the patches.  I've never tested backporting the patches to 3.10.  If you
don't have problems with 3.9 or 3.11, it's hard to say.

The ring testing happens when we initially set up the ring.  The basic idea is
to clear a scratch register or memory buffer to a known value, then write a new
value to that register or buffer using the ring.  When the ring is done if the
new value isn't there, the ring isn't working properly.

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