Hi, My iMac Rev B has the same problem as in this bug: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/65823 Is this reported in other places? Has it been solved? If I increase the volume of the microphone in the recording tab of alsamixer, I can make feedback, so it does physically work and is sort of controllable, just not as a recording source. Thanks, Nick