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[Paul Graydon <496354@xxxxxxxxxxxxxxxxxx>]

This one affects me as well.  Muting mutes the master, and headphone and
PCM.  Unmuting only unmutes Master.

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https://bugs.launchpad.net/bugs/496354

Title:
  amixer doesn't seem to unmute audio

Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: pulseaudio

  When i run
  amixer -Dhw:0 set 'Master' unmute
  The volume appears to be unmuted in alsamixer, but the sound is not actually unmuted, and all the GUI tools show the sound is muted. 

  I've attached a log, of the following...
  pressing the mute button on my keyboard, so the sound is muted.
  using the unmute command so the sound should be unmuted.
  playing a sound in pidgin, getting no sound, because the sound is still muted.
  hitting the mute button on my keyboard again, which actually unmutes the sound.
  playing a sound in pidgin, and getting sound

  I've also attached a screenshot, showing the GUI saying the sound is
  muted, while alsamixer is saying that it isn't.

  Note that while unmute doesn't work, setting the volume does.
  amixer -Dhw:0 set 'Master' 100%
  Works as expected, for example.

  I'm also affected by #352732, maybe related.

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