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Message #145903
[Bug 1506107] Re: Bad webcam video rendering when using XV acceleration on Skylake gpus.
updated the changelog comment to add more info
** Patch removed: "xserver-xorg-video-intel_2.99.917-1~exp1ubuntu2.3.debdiff"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1506107/+attachment/4494656/+files/xserver-xorg-video-intel_2.99.917-1%7Eexp1ubuntu2.3.debdiff
** Patch added: "xserver-xorg-video-intel_2.99.917-1~exp1ubuntu2.3.debdiff"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1506107/+attachment/4507589/+files/xserver-xorg-video-intel_2.99.917-1%7Eexp1ubuntu2.3.debdiff
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https://bugs.launchpad.net/bugs/1506107
Title:
Bad webcam video rendering when using XV acceleration on Skylake gpus.
Status in HWE Next:
New
Status in xserver-xorg-video-intel package in Ubuntu:
Fix Released
Status in xserver-xorg-video-intel-lts-vivid package in Ubuntu:
New
Status in xserver-xorg-video-intel source package in Trusty:
Invalid
Status in xserver-xorg-video-intel-lts-vivid source package in Trusty:
In Progress
Status in xserver-xorg-video-intel source package in Vivid:
In Progress
Status in xserver-xorg-video-intel-lts-vivid source package in Vivid:
Invalid
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.
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References