I found, or rather stumbled on to, a workaround to the problem. At the
end of the day I usually go from logged in to shutdown of my computer.
More recently, when I went to shutdown the machine a box popped up
asking me for the password to get root perms. I don't remember if it was
now asking for root perms to allow shutdown or it thought another user
was logged in. Instead of giving the password (as i wasn't sure why the
box popped up at that time), I hit a Cancel in the dialog and that
logged me out to the gdm login screen instead of doing a shutdown. I
then did the shutdown from the gdm screen.

The next day when I went to turn on my computer, I was surprised to find
that the alsa mixer settings were restored properly. It played a sound
which I could hear after entering my password when logging in. All
sounds from gdm were audible without me having to open up the mixer
settings and reset things.

It seems to me that mixer settings are not save when going from logged
in to system shutdown. Mixer settings are being saved when you logout
before a shutdown. This should give help someone to track down the
problem and get it fixed. If you have to keep fiddling with audio
settings on each boot, just log out to gdm before you next shutdown. You
should not have to fiddle with the settings after the next boot.

-- 
Master, Headphones and PCM muted at reboot
https://bugs.launchpad.net/bugs/432660
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