Comment 29 for bug 1245020

you still not tell me whether your ao722 support headset Mic or not ?

auto Mic in driver is automatically disabled when there are three mics and they are not dock Mic, ext mic and int Mic which have known priority

Simple mixer control 'Input Source',0
  Capabilities: cenum
  Items: 'Mic' 'Internal Mic' 'Mic 1'
  Item0: 'Internal Mic'

have you found the node (0x1a or 0x1b) of ext mic using hda-jack-sense-test ? the state of the node change to yes

use hda-jack-retask to change the pin default of the headset Mic node from [Jack] to [N/A] if ao722 does not support headset Mic