Comment 12 for bug 315809

Confirmed on my HP Pavilion dv9830 laptop. Symbolic link in /etc/rcS.d/ is missing. Be sure to check inside /etc/init.d/alsa-utils for the correct filename to use for the link (the comments near the top of the file will give you instructions on how to remove the autosave/autoload features, so just kinda follow it in reverse). When I created a symlink in /etc/rcS.d/ , everything worked again.

The fact that audio seems to be muted in the first place appears to be a regression of the bug that afflicted Hardy Heron.