[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #29 from Ben Widawsky <ben at bwidawsk.net> ---
(In reply to comment #27)

> > The only interesting patch I can suggest atm is
> > 
> > commit 31643d54a739382626c27c0f2a12b3bbc22d1a38
> > Author: Ben Widawsky <ben at bwidawsk.net>
> > Date:   Wed Sep 26 10:34:01 2012 -0700
> > 
> >     drm/i915: Workaround to bump rc6 voltage to 450
> >     
> >     BIOS should be setting the minimum voltage for rc6 to be 450mV. Old or
> >     buggy BIOSen may not be doing this, so we correct it for them. Ideally
> >     customers should update the BIOS as only it would know the optimal
> >     values for the platform, so we leave that fact as a DRM_ERROR for the
> >     user to see.
> > 
> > in 3.8-rc1 or look for a BIOS update.
> 
> I have H61M/U3S3 motherboard and you latest BIOS ver 2.20 from 8/15/2012
> ftp://174.142.97.10/bios/1155/H61MU3S3(2.20)ROM.zip
> How to check problem persists or not?

The easiest way is to apply the patch and look for DRM_DEBUG_DRIVER messages.
This is unlikely to fix the problem, but also can't hurt.

We've only assumed new BIOS will fix the problem, but who knows. Especially if
it's a 3rd party BIOS.

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