Public bug reported:

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.

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New

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amixer doesn't seem to unmute audio
https://bugs.launchpad.net/bugs/496354
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