[Bug 57461] [GM45] early in dmesg: *ERROR* EDID checksum is invalid

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https://bugzilla.kernel.org/show_bug.cgi?id=57461





--- Comment #7 from Imre Deak <imre.deak at gmail.com>  2013-05-06 13:06:59 ---
Created an attachment (id=100831)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=100831)
fix for dpaux false timeouts

> Imre, this smells a bit like the gmbus version of the wait_for_event_timeout
> bug you've tracked down in dp aux transactions. Can you please attach a quick
> test patch?

I attached the fix for both DP and GMBUS.

I'm not sure how this could be GMBUS related though, since afaics on GM45 we
don't use IRQ for GMBUS transfers. At least since commit #c12aba5aa0 -
"drm/i915: stop using GMBUS IRQs on Gen4 chips".

Also with DP we'd get an error message about the timeout and I don't see any
trace of it in the attached dmesg. So I'm doubtful this will fix anything but
maybe I'm missing something..

Andreas could you try applying both patches on the
git://people.freedesktop.org/~danvet/drm-intel drm-intel-nightly branch and see
if you can still reproduce the issue? Also a dmesg log would be nice with the
drm.debug=0xf kernel parameter.

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