To sum up what happened/will happen:

The developer of xfce4-volumed said that xfce4-volumed isn't compatible
with pulseaudio, but that's not really accurate. The first problem is a
default settings issue (preselection of the correct gst card/channel),
and the second culprit is gstreamer pulse plugin is one culprit
(basically, the bindings suck, let's say it).

I added a patch in precise to try to preselect a pulseaudio card on
Xubuntu (starts by "Playback", contains "PulseAudio"). Obviously that's
not optimal, when e.g., the HDMI card is listed before the main card,
xfce4-volumed will choose the wrong card (and that's what happens for
many people unfortunately).

A few months ago, I "forked" xfce4-volumed and ported it locally to pulseaudio. 
It works fine here (it takes the default pulse card, you can't change it with 
xfconf-query anymore, but with pactl or the pulseaudio mixer), but it didn't 
have many testing and I haven't had time to include it in Xubuntu anyway.
Testing welcome: the sources are at 
<http://lionel.lefolgoc.net/gitweb/?p=xfce4-volumed-pulse.git;a=summary>, and 
test packages called "xfce4-volumed-pulse" for precise and quantal are in my 
ppa <https://launchpad.net/~mrpouit/+archive/ppa> (don't forget to disable 
xfce4-volumed from autostart or uninstall it).

Xfce4-mixer 4.10 (gstreamer) now has support for keybindings, so I plan
to replace xfce4-volumed in raring by its pulseaudio "port". People who
don't like pulseaudio can still use xfce4-mixer 4.10, and hopefully
other people should have working volume keys out of the box in raring.

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https://bugs.launchpad.net/bugs/883485

Title:
  Pulse Audio don't get unmuted when XF86AudioMute is used

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