Subject: Bug#689268: Intel HD 4000 (Ivy Bridge) graphics
freeze



Le samedi 19 janvier 2013 Ã 19:23 +0100, Vincent Blut a Ãcrit :
> > Am 10.01.2013 09:39, schrieb Riku Voipio:
> >
> > > getting hangs on anything other than the Debian 3.2.32-1 has
> > > been challenging. If if's just timing based, I might just have
> > > been lucky during my bisects.
> >
> > Here vanilla 3.4.24 from kernel.org runs absolutely stable since a few
> > weeks. But me came up another idea:
> >
> > 'modinfo i916' list an option which appears to be a watchdog function:
> >
> > "parm: enable_hangcheck:Periodically check GPU activity for
> > detecting hangs. WARNING: Disabling this can cause system wide hangs.
> > (default: true) (bool)"
> >
> > which actually describes the symptoms. Could it be that in the
><...

i> > Debian-kernel either the hangs are not detected securely, or that it
> > just fails to reset the module?
> >
> > /Ingo
>
> Hi guys,
>
> Well I have the same issue on my Ivybridge system:
>
> $ lspci -nnv | grep VGA
> 00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core
> processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA
> controller])
>
> $ cat /var/log/Xorg.0.log | grep "Graphics Chipset"
i>
> [â]
> [ 8.388] (II) intel(0): Integrated Graphics Chipset: Intel(R) Ivybridge
> Mobile (GT2)
>
> On my system I observed this behavior:
>
> Debian 3.2.35-2: random hangs (at least one per day)
> Upstream 3.2.37: random hangs (at least one per day)
> Upstream 3.3-rc1+: no hangs (tested for 2 weeks)
>
> So that seems to be close to Riku's experience.
>
> Anyway what strikes me a bell is the last Ingo's comment about
> 'enable_hangcheck' module parameter
> which was introduced in v3.1-rc1:
>
> $ git tag --contains 6e96e7757a01
> v3.1-rc1
> [â]
> v3.8-rc4
>
> So I peeked about what kind of "hangcheck" changes could have been introduced
> in v3.3-rc1
> and I found an interesting patch:
>
> commit e6bfaf854272ec4641a9ef7b1cb1ca963031ba95
&g...

t; drm/i915: don't bail out of intel_wait_ring_buffer too early
>
> The commit message is particularly interesting!
>
> I'll give it a try but if someone could beat me to it that would be cool (ULV
> CPU here).

Unfortunately this commit has no positive effect! I got two freezes in
less than 15 minutes, so I set up an SSH connection in order to catch
some logs but after an uptime of 5h30 the system frozeâ the NIC too so
absolutely nothing useful to report :-(

>
> Cheers,
> Vincent
>
>
> PS: Also, could you give a try to Julien Cristau's kernel images with DRM/KMS
> subsystem backported from 3.4
> which might hit Wheezy?
> http://people.debian.org/~jcristau/linux-image-3.2.0-4.drm-amd64_3.2.35-3~jcristau.1_amd64.deb
> sha1sum f6711fe6d0d924aab82ec82fe1a86102a69a8c32
> (There are i686 and i486 flavours if you want)
>
>


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