I have a Dell inspiron 630m + Ubuntu Dapper, and I have the same problem. I don't have sound with mic imput. There isn't the 20db amplification in sound configuration. Mic input is completely mute. It is a small lie, If I shout very extremely in mic at the same time as the reading music, I can hear 0,5% of my voice.
I wish a fix bug in ubuntu edgy Sam [french] -- Microphone does not work on Dell Inspiron 630m https://launchpad.net/bugs/42600 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs