[Bug 28474] [r300g] lugaru/etc locks up laptop

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https://bugs.freedesktop.org/show_bug.cgi?id=28474

--- Comment #14 from Giacomo Perale <ghepeu at virgilio.it> 2010-08-19 07:07:08 PDT ---
Created an attachment (id=37982)
 View: https://bugs.freedesktop.org/attachment.cgi?id=37982
 Review: https://bugs.freedesktop.org/review?bug=28474&attachment=37982

add module parameter to disable polling

Hi,

I'm not sure we're all having the same problem, anyway since this bug report
seems to be more active than the one I started I'll post here too.

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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