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[David Henningsson <1414706@xxxxxxxxxxxxxxxxxx>]

Could we check whether it's the jack detect or the signal which is at
fault here?

To do that, install the alsa-tools-gui package and start hdajackretask.
Select the analog codec, check "advanced override" and for pin 0x1a
(Mic), change "jack detection" to "not present". After applying the
change, now both the "Internal Mic" and "Mic" options should always be
available. So plug your headset in and manually switch to the external
mic.

What is the result now, e g:
 - recording from external mic?
 - recording silence or random buzz noise?
 - recording from internal mic although the external is selected?

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https://bugs.launchpad.net/bugs/1414706

Title:
  [20ALCTO1WW, Realtek ALC292, Black Mic, Left][Lenovo ThinkPad X240]
  external mic has no sound at all

Status in HWE Next Project:
  Incomplete
Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  During this test, an error dialog was thrown, reading:

  The following mixer control(s) might be incorrectly set: 
  Mic is at 0.0%

  Mic is muted
  Please try to fix that (e g by running 
  "alsamixer -D hw:PCH" in a terminal) and see if that solves the problem.
  Would you like to continue troubleshooting anyway?

  However, the System Settings... -> Sound UI shows the mic as not
  muted. When I tried running the alsamixer command, I saw mic and mic-
  boost were both showing 0; I cranked them up to 100, but it made no
  difference. I also tried re-running this command with the mic/mic-
  boost still set to 100 and it threw the same error.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-45.74-generic 3.13.11-ckt13
  Uname: Linux 3.13.0-45-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  doctorow   2636 F.... pulseaudio
   /dev/snd/pcmC1D0c:   doctorow   2636 F...m pulseaudio
   /dev/snd/pcmC1D0p:   doctorow   2636 F...m pulseaudio
   /dev/snd/controlC0:  doctorow   2636 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Jan 26 16:20:49 2015
  InstallationDate: Installed on 2014-09-10 (138 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  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 1 :   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
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  doctorow   2636 F.... pulseaudio
   /dev/snd/pcmC1D0c:   doctorow   2636 F...m pulseaudio
   /dev/snd/pcmC1D0p:   doctorow   2636 F...m pulseaudio
   /dev/snd/controlC0:  doctorow   2636 F.... pulseaudio
  Symptom_Jack: Black Mic, Left
  Symptom_Type: No sound at all
  Title: [20ALCTO1WW, Realtek ALC292, Black Mic, Left] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/24/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GIET75WW (2.25 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20ALCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98401 PRO
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGIET75WW(2.25):bd06/24/2014:svnLENOVO:pn20ALCTO1WW:pvrThinkPadX240:rvnLENOVO:rn20ALCTO1WW:rvr0B98401PRO:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20ALCTO1WW
  dmi.product.version: ThinkPad X240
  dmi.sys.vendor: LENOVO
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2015-01-22T13:36:22.741441

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