Comment 66 for bug 318942

Yeah, Mauricio's solution worked better for me (HP 1035NR, lpia -- headphones and speakers work, no need to unmute on boot). Just a few notes for completeness:

If you want to make sure you keep these versions of alsa you've just installed so future upgrades don't overwrite them, you can do this:
echo alsa-base hold | sudo dpkg --set-selections
echo alsa-oss hold | sudo dpkg --set-selections
echo alsa-utils hold | sudo dpkg --set-selections

And if you're like me, you'll want to uninstall xmlto and xmltoman, as well as its dependencies, after you've compiled and installed alsa:
sudo dpkg -P xmlto xmltoman docbook-xsl docbook-xsl-doc-html

Thanks all!