Followed slava-dr tipps, but didn't manage to get external mic working
on asus x555ua.

Any more tips on how to connect "unconnected pins" ?

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  [X555UA, Realtek ALC256, Mic, Internal] No sound at all

Status in alsa-driver package in Ubuntu:

Bug description:
  Internal mic doesn't work for Asus X555UA, Codec: Realtek ALC256

  speakers work, it's just the mic not working.

  sudo hda-verb /dev/snd/hwC0D0 0x1a SET_AMP_GAIN_MUTE 0x5003
  sudo hda-verb /dev/snd/hwC0D0 0x1a SET_AMP_GAIN_MUTE 0x6003
  sudo hda-verb /dev/snd/hwC0D0 0x23 SET_AMP_GAIN_MUTE 0x5200
  sudo hda-verb /dev/snd/hwC0D0 0x23 SET_AMP_GAIN_MUTE 0x6200
  sudo hda-verb /dev/snd/hwC0D0 0x08 SET_AMP_GAIN_MUTE 0x503f
  sudo hda-verb /dev/snd/hwC0D0 0x08 SET_AMP_GAIN_MUTE 0x603f
  sudo hda-verb /dev/snd/hwC0D0 0x08 SET_POWER_STATE 0
  sudo hda-verb /dev/snd/hwC0D0 0x1a SET_POWER_STATE 0

  8 lines make mic working until reboot.

  thx a lot for

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
   /dev/snd/pcmC0D0c:   ubuntu     1983 F...m pulseaudio
   /dev/snd/controlC0:  ubuntu     1983 F.... pulseaudio
  CasperVersion: 1.376
  CurrentDesktop: Unity
  Date: Sun Jun 26 23:56:46 2016
  LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
   PATH=(custom, no user)
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH failed
  Symptom_AlsaRecordingTestStderr: a r e c o r d :   p c m _ r e a d : 2 0 3 2 
:   r e a d   e r r o r :   I n p u t / o u t p u t   e r r o r
  Symptom_Card: Built-in Audio - HDA Intel PCH
   /dev/snd/pcmC0D0c:   ubuntu     1983 F...m pulseaudio
   /dev/snd/controlC0:  ubuntu     1983 F.... pulseaudio
  Symptom_Jack: Mic, Internal
  Symptom_Type: No sound at all
  Title: [X555UA, Realtek ALC256, Mic, Internal] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install) 01/23/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X555UA.206
  dmi.board.asset.tag: ATN12345678901234567 X555UA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
dmi:bvnAmericanMegatrendsInc.:bvrX555UA.206:bd01/23/2016:svnASUSTeKCOMPUTERINC.:pnX555UA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX555UA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: X555UA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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