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[Yu Ning <ning.yu@xxxxxxxxxxxxx>]

In my side the issue is fixed by a patch:
https://code.launchpad.net/~yuningdodo/ubuntu/trusty/unity-settings-daemon/unity-settings-daemon.lp1396464-set-volume-to-zero-before-mute/+merge/242869

it seems volume can't be set to zero if we have already "set mute", so
my solution is adjusting volume before setting mute.

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https://bugs.launchpad.net/bugs/1396464

Title:
  Audio switch between mute and unmute automatically and repeatedly

Status in “unity-settings-daemon” package in Ubuntu:
  New

Bug description:
  Steps:
  1. Install Ubuntu 14.04.1 image
  2. launch "System Settings" -> "Sound"
  3. press "Volume Down" until mute
  4. press "Volume Down" for several times then press "Volume Up" immediately
  5. repeat step 4 for several times

  Excepted result:
  everything should just works

  Actual result:
  system auto switch between mute and unmute automatically and repeatedly.

  Once the issue is reproduced we can found cpu is running at 100% by several processes:
  * pulseaudio
  * unity-control-center
  * unity-panel-service

  The issue will last until we close the "Sound" window.

  unity-settings-daemon version is 14.04.0+14.0420140606-0ubuntu1

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