[Bug 1220645] Re: Webcam capture plays green screen through xv on Haswell platform

[Yung Shen]

Some more updates to this bug:

When you recording from webcam directly to a file,
and play this file with totem it plays green screen,
however using other video output driver could play normally.

to record:

$ avconv -f video4linux2 -i /dev/video0 -f avi output.avi

then:

$ mplayer output.avi
result: green

$ mplayer output.avi -vo x11
result: normal

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Title:
  Webcam capture plays green screen through xv on Haswell platform

Status in “ubiquity” package in Ubuntu:
  Won't Fix
Status in “xorg-lts-raring” package in Ubuntu:
  Confirmed

Bug description:
  xv driver is having playback issue with webcam capture, it plays green
  screen.

  It was firstly found when using stock 12.04.3 image, during on
  installing step of "Choose a Picture", the webcam view only playback
  with green screen, but it still can capture correctly if you hit the
  button.

  After completely installed 12.04.3 system or upgrade your X driver stack to lts-raring,
  on system with haswell chipset, webcam capture will playback with green screen.

  
  To reproduced this problem we could use:

  guvcview

  luvcview

  mplayer tv:///dev/video0 -vo xv

  vlc v4l2:/ //dev/video0 -V xv

  
  On the same hardware system,

  To validate that webcam works fine with other output drivers:

  luvcview -w

  mplayer tv:///dev/video0 -vo x11

  vlc v4l2:/ //dev/video0 -V glx


  By downgrade to xserver-xorg-lts-quantal also fixes this issue,
  its also verified on 12.04.2 stock image with the same webcam.
  Affected webcams:

  1bcf:289e Sunplus
  1bcf:2985 Sunplus
  0c45:64af Microdia
  0c45:64ad Microdia
  064e:812c Suyin

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xserver-xorg-lts-raring 1:7.7+1ubuntu4~precise1
  ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  Date: Wed Sep  4 06:59:59 2013
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: xorg-lts-raring
  UpgradeStatus: No upgrade log present (probably fresh install)

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