Bug#780686: linux-image-3.16.0-4-amd64: Intel GPU hang in intel_crtc_wait_for_pending_flips on IvyBridge, Haswell

[Chris Bainbridge]

Package: src:linux
Version: 3.16.7-ckt7-1
Severity: normal

Dear Maintainer,

As documented at
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1384342 a
GPU hang will regularly occur on Intel IvyBridge and Haswell GPUs.

This was fixed upstream in patches 48bf5b2 and 2a92d5b which were included
in Linux 3.19.

Author: Chris Wilson <***@chris-wilson.co.uk>
Date: Sat Dec 27 09:48:28 2014 +0000

drm/i915: Ban Haswell from using RCS flips

Like Ivybridge, we have reports that we get random hangs when flipping
with multiple pipes. Extend

commit 2a92d5bca1999b69c78f3c3e97b5484985b094b9
Author: Chris Wilson <***@chris-wilson.co.uk>
Date: Tue Jul 8 10:40:29 2014 +0100

drm/i915: Disable RCS flips on Ivybridge

to also apply to Haswell.

[Ben Hutchings]

Control: tag -1 moreinfo

Post by Chris Bainbridge
Package: src:linux
Version: 3.16.7-ckt7-1
Severity: normal
Dear Maintainer,
As documented at
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1384342 a
GPU hang will regularly occur on Intel IvyBridge and Haswell GPUs.
This was fixed upstream in patches 48bf5b2 and 2a92d5b which were
included in Linux 3.19.
Date: Sat Dec 27 09:48:28 2014 +0000
drm/i915: Ban Haswell from using RCS flips
Like Ivybridge, we have reports that we get random hangs when flipping
with multiple pipes. Extend
commit 2a92d5bca1999b69c78f3c3e97b5484985b094b9
Date: Tue Jul 8 10:40:29 2014 +0100
drm/i915: Disable RCS flips on Ivybridge
to also apply to Haswell.

Both of those fixes are included in 3.16.7-ckt7-1, the version you
reported this against. Are you still seeing a similar problem?

Ben.

[Chris Bainbridge]

Post by Ben Hutchings
Both of those fixes are included in 3.16.7-ckt7-1, the version you
reported this against. Are you still seeing a similar problem?

So they are. Hmm. I was getting a hang every day or so with
3.16.7-ckt7-1. With latest linux git I am getting zero hangs. There
was also a report in the Launchpad bug from someone who was still
getting hangs using a kernel with the fix. So it appears there is some
other fix that is still missing, but there are a lot of drm/i915
changes between 3.16 and current git. Do you mass import drm fixes or
do you require a cherry picked patch?

[Ben Hutchings]

Control: tag -1 upstream fixed-upstream

Post by Chris Bainbridge

Post by Ben Hutchings
Both of those fixes are included in 3.16.7-ckt7-1, the version you
reported this against. Are you still seeing a similar problem?

So they are. Hmm. I was getting a hang every day or so with
3.16.7-ckt7-1. With latest linux git I am getting zero hangs. There
was also a report in the Launchpad bug from someone who was still
getting hangs using a kernel with the fix. So it appears there is some
other fix that is still missing, but there are a lot of drm/i915
changes between 3.16 and current git. Do you mass import drm fixes or
do you require a cherry picked patch?

We need cherry-picked patches. Pulling the whole lot is sure to bring
in new regressions as well as fixes.

Ben.

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