[Bug 1703946] Re: Dedicated mono test sound is unavailable

[Will Cooke]

The files look right, and I can reproduce this on one of my test
machines.  I can't reproduce it anymore on an updated daily ISO.  So I
think this is something machine specific.  Looking at the code it looks
like canberra is failing to play the "new" sound and so failing back to
play the test sound (white noise).  I can't work out why it's doing this
yet.  I need to get more debug info out of libcanberra I think.

This might be futile though, if it works everywhere else.

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https://bugs.launchpad.net/bugs/1703946

Title:
  Dedicated mono test sound is unavailable

Status in sound-theme-freedesktop package in Ubuntu:
  Fix Released

Bug description:
  When testing stereo speakers you get the "Front left" and "Front
  right" samples, but no such sample exists for mono speakers e.g.
  HSP/HFP bluetooth devices.

  Instead you get played the "audio-test-signal" which is white noise.
  To begin with I thought this was a problem with Bluetooth or the
  speaker itself, but it's just the sample being used.

  There is a bug upstream to provide this sample, but in the meantime I
  think playing the "audio-channel-front-center.oga" is a suitable
  standin.

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