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[Raymond <1393502@xxxxxxxxxxxxxxxxxx>]

If only hp pin report status of combo jack, you need to specify mic pin
as heaset mic

control.20 { iface CARD name 'Mic Jack' value false comment { access read type BOOLEAN count 1 } }
 control.21 { iface CARD name 'Speaker Front Phantom Jack' value true comment { access read type BOOLEAN count 1 } }
 control.22 { iface CARD name 'Speaker Surround Phantom Jack' value true comment { access read type BOOLEAN count 1 } } 

control.23 { iface CARD name 'Headphone Jack' value true comment {
access read type BOOLEAN count 1 } }

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https://bugs.launchpad.net/bugs/1393502

Title:
  [MacBookPro11,3, Cirrus Logic CS4208, Pink Mic] Combo jack not
  recognized.

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  New Macbook comes with a four-conductor TRRS jack for headset.

  With headset plugged in the microfone is recognized on Mac os-x.
  Ubuntu recognizes the external headphones but not the microphone.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
  Uname: Linux 3.16.0-23-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  mikaelb    2403 F.... pulseaudio
   /dev/snd/controlC0:  mikaelb    2403 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Nov 17 18:58:35 2014
  InstallationDate: Installed on 2014-10-20 (28 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Pink Mic, N/A
  Symptom_Type: No auto-switch between inputs
  Title: [MacBookPro11,3, Cirrus Logic CS4208, Pink Mic, N/A] No autoswitch
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/12/2014
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP112.88Z.0138.B07.1402121134
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-2BD1B31983FE1663
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,3
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-2BD1B31983FE1663
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP112.88Z.0138.B07.1402121134:bd02/12/2014:svnAppleInc.:pnMacBookPro11,3:pvr1.0:rvnAppleInc.:rnMac-2BD1B31983FE1663:rvrMacBookPro11,3:cvnAppleInc.:ct10:cvrMac-2BD1B31983FE1663:
  dmi.product.name: MacBookPro11,3
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2014-11-10T22:25:45.211791

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