Ubuntu
alsa-driver package

  1. Bug #1410618
  2. Comment #4

Comment 4 for bug 1410618

Revision history for this message
chrisolof (chrisolof) wrote :

Sure enough - it would appear the windows driver doesn't support the TRRS mic on this CS4208 chip either:
https://discussions.apple.com/thread/5862553

So then, OSX's driver for the chip would likely hold the key to this.