*** This bug is a duplicate of bug 200338 ***
https://bugs.launchpad.net/bugs/200338
The MCP51 mixer gets muted unless you specify correct model option.
The file /usr/share/doc/alsa-base/driver/ALSA-configuration.txt.gz lists
different options for driver snd-hda-intel. For instance, my mobo is
ASUS M2NPV-VM, and model alsa-dig seems to work on it.
You can try different model names until you get mixer unmuted.
Remove snd-hda-intel module and reinstall it with correct "model", e.g.,
sudo rmmod snd_hda_intel
sudo modprobe snd_hda_intel model=alsa-dig
If the module is in use, see which process keeps it open with
sudo lsof /dev/snd/*
and kill the processes.
As permanent fix, add line with correct module option to
/etc/modprobe.d/options:
options snd-hda-intel model=alsa-dig
Also, make sure that you don't already have an incorrect options line.
--
MCP51 HD Audio not detected in kernel 2.6.24-12-generic
https://bugs.launchpad.net/bugs/200523
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