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[dronus <1422680@xxxxxxxxxxxxxxxxxx>]

I've installed 3.19.0-031900-generic.

The regression is fixed, partly.

VLC, Chrome and Firefox are able to use it again by their default
settings.

guvcview is not, the preview image is still lacking, however the
warnings have changed, no more 'device busy', but several warnings
instead:

control id: 0x009a0901 failed to get value (error -1)
control id: 0x009a0902 failed to get value (error -1)
control id: 0x009a0903 failed to get value (error -1)
control id: 0x009a0908 failed to get value (error -1)
control id: 0x009a0909 failed to get value (error -1)
control id: 0x009a090d failed to get value (error -1)

guvcview was working well with 3.2 too. However, this may be an
compatibility problem that is caused by guvcview's implementation
details.

If this is clarified, we nay tag 'kernel-fixed-upstream'.

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https://bugs.launchpad.net/bugs/1422680

Title:
  v4l2 regression: T420s built in camera stopped working

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  The  Chicony Electronics Camera (as built into for example Lenovo
  T420s) stopped working somewhere between kernel 3.2 and 3.13.

  I use both kernels in Ubuntu 12.04, and the camera works with the
  older one, so I filed the bug here as I don't know when it stopped
  working.

  The camera is still recognized by v4l2, properties can be accessed by
  v4l2-ctl for example, and seemed correctly reported back (pixelformats
  for exmaple match my expectation).  But the frame capturing intself
  will always fail with 'device busy'.

  Usb IDs:
  04f2:b221 Chicony Electronics Co., Ltd integrated camera

  
  What further information would be useful?

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