Node 0x12 [Pin Complex] wcaps 0x41000b: Stereo
 Amp-In Amp-In caps: ofs=0x00, nsteps=0x02, stepsize=0x27, mute=0 
Amp-In vals: [0x00 0x00] 
Pincap 0x00000020: IN Pin Default 0x400000f0: [N/A] Line Out at Ext N/A Conn = 
Unknown, Color = Unknown DefAssociation = 0xf, Sequence = 0x0 
Pin-ctls: 0x00: 
Delay: 1 samples

If pin 0x12 is the headset mic, you need to set pin cfg to a headset mic
jack

so that driver set pin ctl to IN instead of 0

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https://bugs.launchpad.net/bugs/1329191

Title:
  [MacBookAir5,1, Cirrus Logic CS4206, Blue Line In, Rear] Line In using
  TRRS plug does not work correctly

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