[Bug 29787] random XRandR failures (i2c related?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29787

--- Comment #10 from j.bormolini at gmail.com 2010-10-04 20:38:36 PDT ---
I see essentially the same thing as Arno. I have an AMD 780G motherboard
(radeon hd3200 / rs780). The only time I noticed the problem was when running
mplayer - it pauses for a split second every minute or so. I'm using HDMI for
video and audio.

The option to disable polling is (now?) part of drm_kms_helper, so adding
"drm_kms_helper.poll=0" to the kernel cmdline disables polling and completely
fixes the problem for me. I'm using kernel 2.6.36-rc6. Hopefully this helps
anyone else who stumbles on this problem.

I just remembered (too late, doh!), that a while ago I set X and hd-audio[01]
to RT priority when running mplayer as an experiment to test performance. I'm
pretty sure I saw the problem before that, but if I ever get around to
rebooting I'll test with polling enabled and the priorities unchanged.
Presumably Arno does not change his priorities and still sees the problem.

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