All the problems I read about were all about the sound not working when they plugged the headphones in.
I have the problem that my mic will work but the sound is still played on my built-in speakers. When I look at the sound settings, it doesn't give me any options for headphones.
I run 12.04 and never had this problem in Windows. I run it on a Acer Aspire 5920g.
Any tips or ideas will be very helpful.