Comment 14 for bug 464301

This thread did it for me: http://ubuntuforums.org/showthread.php?t=1308393
Bottom line is:
Go to System > Admin > Hardware Drivers.
Disable the Modem Software driver.

There is more info in the thread, including a link to http://drowninginbugs.blogspot.com/2009/10/caveats-for-audio-in-910.html, with more options to get your audio working in 9.10.

Regards,
Kurt