Hi Matthew,
I've lost the original message-id so I've started a new thread with the
same subject (nabble, gmane, etc. don't provide the original message
headers).
I'm guessing that your mute control and volume controls have become
attached to different sound channels.
I had a similar problem on f10. I listen to a radio tuner that's fed
into "Line In".
At first the kb mute, volume up, and volume down buttons worked. Then
the mute button went on vacation, i.e. when pressed the popup would show
muted but the sound was not muted. Then yesterday morning I popped in a
CD which brought up Rhythmbox. Volume AND mute buttons were both
working. Well, me thinks, this is cool.
After the CD finished I went back to my radio on Line In but then none
of the keyboard controls worked. :(
It turns out that there is the system volume control (by default on the
default toolbar), the volume controls on the alsamixer, and another
controller found at System->Preferences->Hardware->Sound. From there go
to Default Mixer Tracks and choose (Alsa mixer) from the dropdown box.
There you will see the same controls as on the alsamixer. By holding
shift-control one can select multiple channels to control from the
keyboard. (I deselected master and selected both PCM and Line-in).
Voila'. Now the main volume control handles the master channel and the
keyboard controls pcm and line-in. Since I only use one at a time there
is no conflict for me.
What had happened? Can't say for sure but it seems the the mute button
had become attached to pcm while volume controls were attached to
line-in (which later moved mysteriously to pcm).
So... there is definitely a bug in there somewhere but I don't know
enough yet to help track it down.
Hope that helps.
:m)
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