You might want to look at this thread for fixing sound on internal speakers... No answer for the mic just yet.
http://ubuntuforums.org/archive/index.php/t-1411183.html
Posted by Matt at April 26, 2010 04:15 PMHi Matt,
Thanks for the pointer. I had actually managed to get the speakers working by installing the backports module for alsa, but hadn't had chance to update the post. Will do so now.
Posted by Adrian at April 26, 2010 10:11 PM