@Alex: According to your alsa-info, you're not running the proposed kernel:
!!Kernel Information !!------------------ Kernel release: 2.6.35-24-generic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/497546 Title: Microphones not working on Dell Vostro 320 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs