[Bug 21804] Re: alsa-utils cannot always restore mixer settings correctly across upgrades

[Justin Mason]

this is still an issue in current dapper; it just bit me after a routine
kernel update/reboot.

The error I got was:

: jm 73...; sudo /etc/init.d/alsa-utils start
Password:
 * Setting up ALSA...
 * warning: 'alsactl restore' failed with error message 'alsactl: set_control:894: warning: name mismatch (External Amplifier/Headphone Jack Sense) for control #26
alsactl: set_control:896: warning: index mismatch (0/0) for control #26
alsactl: set_control:898: failed to obtain info for control #26 (Operation not permitted)'...
   ...done.

It was quite tricky to fix, unfortunately, since on my hardware
(Thinkpad T40) enabling "Line Jack Sense" inhibits all audio output as a
side-effect; attempting to manually recreate a working alsamixer setup
led me to switch that on (out of ignorance of the side-effects).

An automatic, script-based recreation of a "sane" mixer setup would have
avoided that mis-step.

-- 
alsa-utils cannot always restore mixer settings correctly across upgrades
https://launchpad.net/bugs/21804