[Bug 23993] OpenGL app crashes randomly with 'drmRadeonCmdBuffer: -12'

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=23993





--- Comment #25 from Pauli <su...@gm...>  2010-01-29 06:27:49 PST ---
Created an attachment (id=32899)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32899)
Possible fix. Only tested with r200 card!

Attached patch applies to current development kernel from Linus' tree
(2.6.33-rc5 should work too).

If you know how to compile your own kernel you can apply that patch to vanila
kernel source and tes if it fixes problems for you. But notice that this only
affects old kernel driver code and new KMS code is not changed anyway. If you
have same dmesg error messange with KMS it is different bug.

I tested patch shortly with r200 card (radeon 9200). Sauerbraten and compiz did
run without crashing.

IMPORTANT: I can't test r300-r500 (radeon 9500-x1950) code path so you must be
extra carefull with those cards. Kernel might crash or corrupt memory if there
is any hiden bugs which may destroy your data or eat your pet. But if you are
still willing to test with one those cards I'm happy to hear about any errors
you might see.


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