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[Horst Schirmeier <horst@xxxxxxxxxxxxxx>]

The newly added workaround ("xfce4-mixer (or Xfce Audio Mixer in panel):
Choose Playback:...(PulseAudio Mixer) instead of (Alsa mixer) as sound
card in properties") fixes the symptoms for me.

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https://bugs.launchpad.net/bugs/1254884

Title:
  Pulseaudio: incoherent muting of ALSA channels (mutes master,
  headphone and speaker, but unmutes only master)

Status in PulseAudio sound server:
  Unknown
Status in pulseaudio package in Ubuntu:
  Confirmed
Status in xfce4-volumed package in Ubuntu:
  Invalid

Bug description:
  with certain audio hardware (those where alsamixer shows separate
  "headphone" and "speaker" channels) pressing of the mute button on
  laptop keyboards causes mute of all three channels: master, headphone
  and speaker. unfortunately, pressing the button again to unmute (or
  deselecting mute in the xfce audio mixer panel applet) unmutes only
  the master channel, leaving headphone and speaker muted. there is no
  other way than opening alsamixer in a terminal (or open mixer controls
  from the applet) and manually clicking the two remaining channels to
  unmute.

  Update: another workaround when using xfce4-mixer (or Xfce Audio Mixer
  in panel): Choose Playback:...(PulseAudio Mixer) instead of (Alsa
  mixer) as sound card in properties.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: xfce4-volumed 0.2.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
  Uname: Linux 3.11.0-13-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  Date: Mon Nov 25 22:33:06 2013
  InstallationDate: Installed on 2013-11-07 (17 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  SourcePackage: xfce4-volumed
  UpgradeStatus: No upgrade log present (probably fresh install)

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