After further googling and tinkering, the solution I discovered is as follows:
Running gstreamer-properties showed that some Default Input plugin was "Custom" and the pipeline was something I don't remember. This didn't seem right, so I changed the plugin to ALSA and then the mic worked. However, Skype still didn't want to detect my voice. I traced this to it automatically changing the mixer levels (which can be shut off). The last tweak was to manually set one input channel to 0 with pulse volume control, and then other way up. Skype hears me again; wonderful. Now I'm left wondering, however, why everything worked seamlessly a week ago, and then out of "nowhere" the mic stopped working. Some update or install somewhere messed it all up... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/997914 Title: Microphone does not pick up sound To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/997914/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs