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I have a HP dv3t and the following worked for me:

Do what cbender did near the bottom of this post:
http://ubuntuforums.org/showthread.php?t=1140477&highlight=hp+laptop+no+sound
...

@cbender

You are a champ sir; the line:

options snd-hda-intel model=hp-m4 enable_msi=1
Did the trick! :p