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[christoph <spaem@xxxxxxxxxxx>]

*push*

this happens on the MacBook 6,1 (late 2009) as well. It has the same
Cirrus CS4206.

I just tested the most recent alsa-daily which builds for wily/amd64 without effect. Internal Speakers, Internal Mic, Headphones all work - TRRS mic doesn't work (Mac OS X supports exactly this Headset device out of the box). 
I'm using 15.10 GNOME Ubuntu. In sound settings I can only activate the internal mic and don't even see any external (as with output where the label of the output device automatically changes if the headset is connected). 

uname -r
Linux macbook 4.2.0-23-generic #28-Ubuntu SMP Sun Dec 27 17:47:31 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

running alsa-info.sh (with headset connected) =>
 Your ALSA information is located at http://www.alsa-project.org/db/?f=7556cfd21195211e5d8bd44184d481b0bd26d892

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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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