kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Summary changed:

- Microphone not working on some USB Webcams
+ 04f2:a13b Microphone not working on USB Webcam

** Tags removed: usbaudio webcam
** Tags added: needs-kernel-logs needs-upstream-testing regression-potential

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https://bugs.launchpad.net/bugs/1037630

Title:
  04f2:a13b Microphone not working on USB Webcam

Status in Linaro Ubuntu Engineering Builds:
  New
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Microphone input is not working with at least one USB Webcam under Oneiric and Precise based Linaro Images:
  "arecord -D hw:2,0 -f S16_LE -V mono /tmp/test.wav" only records silence.

  Webcam that fails:
  Pleomax 1.3MP UVC Webcam
  ID 04f2:a13b Chicony Electronics Co., Ltd

  Another webcam works.
  The interesting part is, while the failing webcam does not work with e.g. 3.1.1-29-linaro-lt-omap kernel, it works with the vanilla 3.1 kernel!

  A Workaround is adding the VID/PID to drivers/usb/core/quirks.c, see
  the attachment.

  The following kernel bugs might be related:
  https://bugzilla.kernel.org/show_bug.cgi?id=35922
  https://bugzilla.kernel.org/show_bug.cgi?id=44281

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