I have a similar problem in Kubuntu 11.10. Muting works ok, but unmuting
does not restore the sound. After unmuting I have to toggle also both
the Front and Headphones switches:
$ amixer sset Front toggle; amixer sset Headphone toggle
(In my system PCM has no switch, but "Front" has.)
After that the sound is restored. I suspect that this problem is a
kernel bug in snd-hda-intel module or so.
DISTRIB_DESCRIPTION="Ubuntu 11.10"
uname -a
Linux 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686 i686
i386 GNU/Linux
lspci -V
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
Controller (rev 03)
Subsystem: Dell Device 0233
Flags: bus master, fast devsel, latency 0, IRQ 48
Memory at f6adc000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
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https://bugs.launchpad.net/bugs/876913
Title:
Master, Headphone and PCM mute together
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