Ubuntu
xserver-xorg-video-intel package

Bad webcam video rendering when using XV acceleration on Skylake gpus.

Bug #1506107 reported by Robert Hooker on 2015-10-14

This bug affects 1 person

	Status	Importance	Assigned to
HWE Next	Fix Released	Undecided	Unassigned
xserver-xorg-video-intel (Ubuntu)	Fix Released	Medium	Unassigned
Vivid	Fix Released	Medium	Robert Hooker
xserver-xorg-video-intel-lts-vivid (Ubuntu)
Trusty	In Progress	Medium	Unassigned

Bug Description

CPU: Intel(R) Core(TM) i3-6100U CPU @ 2.30GHz
GPU: Intel Corporation Device [8086:1916] (rev 07)
Webcam: 0bda:57e3 Realtek Semiconductor Corp.

[Impact]
We noticed that webcam output on a wide range of skylake systems contained corruption during certification testing of OEM machines which uses a certain gstreamer pipeline. An example of the corruption is attached.

[Test Case]
1. Boot ubuntu 14.04.3 or 15.04 on a machine with a skylake intel GPU and a webcam
2. Login system and open a terminal.
4. Execute '$ gst-launch-0.10 v4l2src ! xvimagesink'

Expect result:
There should be no visual artifacts during video playing. The artifacts will look like the attached video and be very obvious in the unfixed package.

[Regression Potential]
Low, the fix is very minimal was included immediately after the 2.99.917 release was made. It consists of 2 parts, a small patch (http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=cc9d7f6777703037d0d7eff346dd350f4d8b3f31) and a configure option change. The configure option change was in lieu of http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=986cb2335c30792e24a7e2b930ecaa3fa051809a which flipped it on unconditionally and only affects i915_bpo in both of these releases as it requires a 4.0 or newer kernel (i915_bpo is a backport of i915 from 4.2 that is only used on skylake). Both of these changes are already in wily's xserver-xorg-video-intel.

It has been tested on a large number of machines during certification, and also by me on sandybridge, ivybridge, broadwell and skylake machines.

Tags:

Revision history for this message

Robert Hooker (sarvatt) wrote on 2015-10-14:

VID_20150709_120357.mp4 Edit (7.9 MiB, video/mp4)

Robert Hooker (sarvatt) on 2015-10-14

Changed in xserver-xorg-video-intel (Ubuntu Trusty):
status:	New → Invalid
Changed in xserver-xorg-video-intel (Ubuntu):
status:	New → Fix Released
Changed in xserver-xorg-video-intel (Ubuntu Vivid):
status:	New → In Progress
assignee:	nobody → Robert Hooker (sarvatt)
Changed in xserver-xorg-video-intel-lts-vivid (Ubuntu Trusty):
assignee:	nobody → Robert Hooker (sarvatt)
status:	New → In Progress
Changed in xserver-xorg-video-intel-lts-vivid (Ubuntu Vivid):
status:	New → Invalid

Revision history for this message

Ubuntu Foundations Team Bug Bot (crichton) wrote on 2015-10-14:

The attachment "xserver-xorg-video-intel_2.99.917-1~exp1ubuntu2.3.debdiff" seems to be a debdiff. The ubuntu-sponsors team has been subscribed to the bug report so that they can review and hopefully sponsor the debdiff. If the attachment isn't a patch, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issue please contact him.]

tags:

added: patch

Revision history for this message

Robert Hooker (sarvatt) wrote on 2015-10-28:

xserver-xorg-video-intel_2.99.917-1~exp1ubuntu2.3.debdiff Edit (2.4 KiB, text/plain)

updated the changelog comment to add more info

Mathew Hodson (mhodson) on 2015-11-05

Changed in xserver-xorg-video-intel (Ubuntu):
importance:	Undecided → Medium
Changed in xserver-xorg-video-intel (Ubuntu Trusty):
importance:	Undecided → Medium
Changed in xserver-xorg-video-intel-lts-vivid (Ubuntu):
importance:	Undecided → Medium
Changed in xserver-xorg-video-intel (Ubuntu Vivid):
importance:	Undecided → Medium
Changed in xserver-xorg-video-intel-lts-vivid (Ubuntu Trusty):
importance:	Undecided → Medium
Changed in xserver-xorg-video-intel-lts-vivid (Ubuntu Vivid):
importance:	Undecided → Medium

Keng-Yu Lin (lexical) on 2015-11-10

Changed in hwe-next:
status:	New → Fix Released

Mathew Hodson (mhodson) on 2015-11-10

no longer affects:

xserver-xorg-video-intel-lts-vivid (Ubuntu)

Revision history for this message

Sebastien Bacher (seb128) wrote on 2015-11-10:

It's being handled, getting out of the sponsoring queue

Revision history for this message

Brian Murray (brian-murray) wrote on 2015-11-12: Please test proposed package

Hello Robert, or anyone else affected,

Accepted xserver-xorg-video-intel into vivid-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/xserver-xorg-video-intel/2:2.99.917-1~exp1ubuntu2.3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Changed in xserver-xorg-video-intel (Ubuntu Vivid):
status:	In Progress → Fix Committed
tags:	added: verification-needed

Mathew Hodson (mhodson) on 2015-11-12

no longer affects:	xserver-xorg-video-intel-lts-vivid (Ubuntu Vivid)
no longer affects:	xserver-xorg-video-intel (Ubuntu Trusty)

Revision history for this message

Sebastien Bacher (seb128) wrote on 2015-12-08:

could somebody having the hardware to trigger the issue verify the fix?

Revision history for this message

Robert Hooker (sarvatt) wrote on 2016-01-05:

Working fine here on skylake-y.

tags:

added: verification-done
removed: verification-needed

Revision history for this message

Launchpad Janitor (janitor) wrote on 2016-01-06:

#10

This bug was fixed in the package xserver-xorg-video-intel - 2:2.99.917-1~exp1ubuntu2.3

---------------
xserver-xorg-video-intel (2:2.99.917-1~exp1ubuntu2.3) vivid-proposed; urgency=medium

* Add sna-reject-cpu-blits-that-require-format-conversions.patch and build with
--enable-wc-mmap: Fix webcam problems on Skylake (LP: #1506107)

-- Robert Hooker <email address hidden> Tue, 13 Oct 2015 12:25:21 -0400

Changed in xserver-xorg-video-intel (Ubuntu Vivid):
status:	Fix Committed → Fix Released

Revision history for this message

Chris J Arges (arges) wrote on 2016-01-06: Update Released

#11

The verification of the Stable Release Update for xserver-xorg-video-intel has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

Robert Hooker (sarvatt) on 2017-04-10