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[Raymond <1329191@xxxxxxxxxxxxxxxxxx>]

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

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  Microphone connected via TRRS plug on Macbook Air 5,1 is not
  recognised. Selecting "Analogue In" in Pulseaudio mixer is same as
  selecting "Microphone" - i.e. sounds recorded are always the Internal
  microphone, and not the microphone connected via the TRRS plug. When
  using OSX however, the TRRS microphone works correctly.

  Have tried booting Live CDs of 12.04, 13.04, and 14.04, and even tried
  upgrading kernel to 3.15, and problem persists.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  scrosby    2172 F.... pulseaudio
   /dev/snd/pcmC0D0c:   scrosby    2172 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Thu Jun 12 16:58:10 2014
  InstallationDate: Installed on 2014-02-24 (107 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64+mac (20140223)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH successful
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Blue Line In, Rear
  Symptom_PulseAudioRecordingTest: PulseAudio recording test through plughw:PCH failed
  Symptom_Type: Only some of inputs are working
  Title: [MacBookAir5,1, Cirrus Logic CS4206, Blue Line In, Rear] Recording problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/27/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA51.88Z.00EF.B02.1211271028
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-66F35F19FE2A0D05
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookAir5,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-66F35F19FE2A0D05
  dmi.modalias: dmi:bvnAppleInc.:bvrMBA51.88Z.00EF.B02.1211271028:bd11/27/2012:svnAppleInc.:pnMacBookAir5,1:pvr1.0:rvnAppleInc.:rnMac-66F35F19FE2A0D05:rvrMacBookAir5,1:cvnAppleInc.:ct10:cvrMac-66F35F19FE2A0D05:
  dmi.product.name: MacBookAir5,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  modified.conffile..etc.modprobe.d.alsa.base.conf: [deleted]

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