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[Jeffrey Tees <1313813@xxxxxxxxxxxxxxxxxx>]

On further investigation. Looks similar to Bug #1026331 (duplicate of
#878986). Which, according to the comments on the latter is a Pulseaudio
issue.

Fixed (or rather triaged) by using 
amixer -D pulse set Master toggle 
(which worked for me)
or using 
pactl set-sink-mute <default_sink_name> 0
(which wouldn't recognise the sink name)

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https://bugs.launchpad.net/bugs/1313813

Title:
  amixer 'mute toggle shortcut' problem (can mute but not unmute)

Status in “alsa-utils” package in Ubuntu:
  Confirmed

Bug description:
  Openbox shortcut configuration file on ~/.config/openbox/lubuntu-
  rc.xml triggers to the following command to be executed:

  $ amixer -q sset Master toggle

  This problem is language related/dependent. This works fine on a pure
  english Lubuntu installation (toggle behavior). I installed Portuguese
  language package, on this very same machine, and now shortcut can
  mute, but I need to use the volume control on "tray" to unmute!

  I can solve the issue by running this command:

  $ amixer -q sset Master toggle && amixer -q sset Speaker unmute &&
  amixer -q sset Headphone unmute

  A good workaround is edit  ~/.config/openbox/lubuntu-rc.xml and
  set/reset this config.:

      <keybind key="XF86AudioMute">
        <action name="Execute">
          <command>amixer -q sset Master toggle</command>
        </action>
       <action name="Execute">
  	<command>amixer -q sset Speaker unmute</command>
       </action>
      <action name="Execute">
  	<command>amixer  -q sset Headphone unmute</command>
        </action>
      </keybind>

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-utils 1.0.27.2-1ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: LXDE
  Date: Mon Apr 28 13:19:33 2014
  InstallationDate: Installed on 2014-04-27 (1 days ago)
  InstallationMedia: Lubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  SourcePackage: alsa-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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