[Bug 29389] [r300g] [bisected] hard locks in openarena with kernel 2.6.35

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29389

--- Comment #1 from Giacomo Perale <ghepeu at virgilio.it> 2010-08-19 07:05:58 PDT ---
Created an attachment (id=37981)
 View: https://bugs.freedesktop.org/attachment.cgi?id=37981
 Review: https://bugs.freedesktop.org/review?bug=29389&attachment=37981

add parameter to disable polling

I came back from vacation and found a patch from Chris Wilson in dri-devel who
added a parameter to disable polling; since my bisection run pointed to the
commit who enabled polling as the origin of my problem, I quickly adapted the
patch to vanilla 2.6.35 to do some tests.

The patch is attached to this comment; to try it patch the kernel and boot with
drm_kms_helper.poll=0; be careful, without this parameter sometime X refused to
start here. Since this was only a test I didn't look too hard, I think it's
related to the slow work->workqueues conversion.

Anyway, with polling disabled I was able to play with openarena for about 15
minutes, while with polling (without the patch) I had a hardlock in 30-60s.

Since this could be important, I have a VGA/DVI card and I'm using the DVI
port, with nothing connected to the VGA port.

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