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[Raymond <1315911@xxxxxxxxxxxxxxxxxx>]

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/hda_auto_parser.c?id=1c70a583417e8db1e1d5069d7651ba294e9499de

you need to specify hint by modifying firmware file generated by hda
Jack retask

parser_flags = 4

to force the parser to find headset Mic which have specific sequence
number 0x0c and set misc bit (bit 8)


https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa/HD-Audio.txt


http://voices.canonical.com/david.henningsson/2011/11/29/turn-your-mic-jack-into-a-headphone-jack/

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https://bugs.launchpad.net/bugs/1315911

Title:
  [N550JV, Realtek ALC668, Black Mic, Left] No autoswitch

Status in “alsa-driver” package in Ubuntu:
  Incomplete

Bug description:
  When I plug in the smartphone headset microphone and sound stop
  working. If I go to Pulseaudio Volume Control and I select Internal
  Microphone for input and Speakers for output the hedset works fine. If
  I remove the headset, the speakers and the microphone stop working
  again. I have to manually reset them again to make them working. This
  is really anoying, especially in Skype or Viber.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  adrian    11017 F.... pulseaudio
   /dev/snd/controlC0:  adrian    11017 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun May  4 19:55:50 2014
  InstallationDate: Installed on 2014-04-12 (22 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Black Mic, Left
  Symptom_Type: No auto-switch between inputs
  Title: [N550JV, Realtek ALC668, Black Mic, Left] No autoswitch
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/17/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: N550JV.207
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: N550JV
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN550JV.207:bd09/17/2013:svnASUSTeKCOMPUTERINC.:pnN550JV:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN550JV:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: N550JV
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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