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[Bug 1037630] Re: 04f2:a13b Microphone not working on USB Webcam


Migrated to bugzilla: https://bugs.linaro.org/show_bug.cgi?id=460

** Bug watch added: Linaro Bug Tracking System #460

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  04f2:a13b Microphone not working on USB Webcam

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

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:

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