Mic autoswitching is done based on jack presence:

Simple mixer control 'Mic',0
  Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive penum
  Capture exclusive group: 0
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 80
  Front Left: Capture 80 [100%] [6.00dB] [on]
  Front Right: Capture 80 [100%] [6.00dB] [on]
Simple mixer control 'Mic 1',0
  Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive penum
  Capture exclusive group: 0
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 80
  Front Left: Capture 80 [100%] [6.00dB] [off]
  Front Right: Capture 80 [100%] [6.00dB] [off]

Also, please use ppa:ubuntu-audio-dev's linux-alsa-driver-
modules-$(uname -r).

** Changed in: alsa-driver (Ubuntu)
       Status: New => Incomplete

-- 
Internal Speaker doesn't mute when a headphone is plugged in, Jacksense not 
working. Can't select external mic in the input list
https://bugs.launchpad.net/bugs/558941
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