Public bug reported:

Machine: Asus EeePC 1201N (EU: Atom 330@1.6 Ghz, 3GB Ram, Nvidia ION GPU).
Release: Xubuntu 11.10 Oneiric Ocelot (latest upgrade: Thu Oct 27 22:46:45 UTC 
2011).
Pkg_version: xfce4-mixer 1:4.8.0-2ubuntu1.

1) Try to mute the mixer by pressing "Fn+Mute" hotkeys -> The Master channel 
mutes (any other channel remains at its previous state).
2) Press "Fn+Mute" again to unmute the Master channel  ->  on both xfce4-mixer 
and alsa-mixer the Master channel appears to be unmuted and an "unmuted audio" 
notification shows up but I can't hear any sound.

EXPECTED: A good working hotkeys combination to mute/unmute audio.

WORKAROUND: After having muted with "Fn+Mute" (its Fn+F10 on my
keyboard) you can still re-enable sound by pressing "Fn+Vol-" and then
"Fn+Vol+". This doesn't work when using headphones (??).

MINOR_INFO: pavucontrol returns a "** (pavucontrol:3706): DEBUG: Failed
to initialize device manager extension: No such extension" after
executing it from a terminal.

Thank you in advance!

** Affects: xfce4-mixer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/882837

Title:
  Can't unmute by hotkeys if previously muted

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