** Changed in: xserver-xorg-video-intel-lts-vivid (Ubuntu Trusty)
Assignee: Robert Hooker (sarvatt) => (unassigned)
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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:
Fix Released
Status in xserver-xorg-video-intel package in Ubuntu:
Fix Released
Status in xserver-xorg-video-intel-lts-vivid source package in Trusty:
In Progress
Status in xserver-xorg-video-intel source package in Vivid:
Fix Released
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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