So; for the comment #6 - indicating you need to mute one channel but not the other, that's a hardware dependent bug (and it only occurs for the internal mic, no other inputs) and is solvable at least for some Realtek codecs. Please file a separate bug using "ubuntu-bug alsa-base" - doing so will include relevant hardware info.
If there is a generic problem with Skype only (and other apps work fine), I would need a PulseAudio log to do further troubleshooting. See https://wiki.ubuntu.com/PulseAudio/Log ** Changed in: pulseaudio (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/870969 Title: Microphone doesn't work on Skype or Flash To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/870969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs