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Old 03-19-2010, 01:11 PM
Andy Whitcroft
 
Default i915 powersave/fbc issues on i945 and older

We have been seeing a return of the hanging and going solid colours and
generally jumping about oddly behaviour since the update to DRM 2.6.33.
This seems to be limited to older cards this time, it appears to work
on cards after i945.

I have put together a patch to disable powersaving completely for all
cards i945gm and older. Kernels with this patch applied are available
at the URL below:

http://people.canonical.com/~apw/i915-powersave-broken-lucid/

If people could try this out on their card and report the contents of
their 'dynamic power saving' line that would be helpful. For those with
older cards if you have seen these issues please test to see if they are
resolved:

[ 4.719350] [drm] dynamic power saving: broken=1 enabled=0

Also there are rumours that disabling framebuffer compression only might
also help the issue. Here is a patch stolen from Sarvatt which just
turns that off which is also worth testing if you experience these
issues:

http://people.canonical.com/~apw/i915-fbc-broken-lucid/

Please test and report back here. Thanks!

-apw

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Old 03-21-2010, 02:39 AM
Robert Hooker
 
Default i915 powersave/fbc issues on i945 and older

> Also there are rumours that disabling framebuffer compression only might
> also help the issue. *Here is a patch stolen from Sarvatt which just
> turns that off which is also worth testing if you experience these
> issues:
>
> * *http://people.canonical.com/~apw/i915-fbc-broken-lucid/


Indeed it did turn out to be FBC related, this kernel has worked for
me for 36 hours now post resume. I noticed it was FBC related because
intel_gpu_top showed it 100% busy in framebuffer compression when it
would hang. I have sent my patch along upstream to the intel-gfx list
after speaking to jbarnes in #intel-gfx.

<jbarnes> [14:10:21] +Sarvatt: cool, can you post it?
<jbarnes> [14:10:26] +it should be disabled on 915/945

http://lists.freedesktop.org/archives/intel-gfx/2010-March/006292.html

I am using bug #492393 for dupes for future reference since it's very
distinguishable, the symptoms are hanging with a solid color screen
after resume, no GPU hang in dmesg when it happens, 915-945 mobile
chipsets, powersave=0 fixes it, and another suspend/resume cycle
clears it for a few hours more until it eventually hangs. With 2.6.32
drm it would flicker post resume until it eventually hung, but only
the hangs are still there with the .33 drm on 2.6.32-16+

Thanks,
Robert

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Old 04-01-2010, 09:06 PM
Bryce Harrington
 
Default i915 powersave/fbc issues on i945 and older

On Sat, Mar 20, 2010 at 11:39:53PM -0400, Robert Hooker wrote:
> > Also there are rumours that disabling framebuffer compression only might
> > also help the issue. *Here is a patch stolen from Sarvatt which just
> > turns that off which is also worth testing if you experience these
> > issues:
> >
> > * *http://people.canonical.com/~apw/i915-fbc-broken-lucid/
>
> Indeed it did turn out to be FBC related, this kernel has worked for
> me for 36 hours now post resume.

Just to doublecheck - is this issue now considered resolved?

Thanks,
Bryce

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