I noticed that on several Dell laptops that I’ve upgraded to Debian 8
‘Jessie’ with the XFCE desktop environment, that the keyboard mute
button had stopped working. Or rather, the button mutes the audio
just fine, but pressing it again doesn’t actually unmute again. To
get audio back, you have to manually invoke
alsamixer and unmute
It turns out that the fix is remarkably simple:
sudo apt-get install gstreamer0.10-pulseaudio
You can then, if you want, verify that it worked by running
xfconf-query -lc xfce4-mixer before and after installing
gstreamer0.10, but this isn’t a key part of the process.
From what I can tell, the issue is a missing dependency in one of the XFCE audio packages, but I’m damned if I know which one exactly.
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