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[David Henningsson <1414706@xxxxxxxxxxxxxxxxxx>]

No obvious difference (all coefs are the same!), but several things are
differing, first, the product name:

-Product Name:      20AMOS3
+Product Name:      20AMZ02QUS

Second, even the hardware is of a later revision:

-00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 03)
+00:1b.0 Audio device: Intel Corporation Lynx Point-LP HD Audio Controller (rev 04)

Second, firmware, kernel and ALSA dkms are all newer on the working one:

-Firmware Version:  GIET53WW (2.01 )
+Firmware Version:  GIET60WW (2.10 )

-Kernel release:    3.13.0-32-generic
+Kernel release:    3.13.0-46-generic

-[   15.242582] snd_hda_intel 0000:00:1b.0: Probing card using HDA DKMS, version 0.201502151246~ubuntu14.04.1
+[   13.866567] snd_hda_intel 0000:00:1b.0: Probing card using HDA DKMS, version 0.201503011031~ubuntu14.04.1

On the non-working one, please try updating both the firmware, the kernel, and the ALSA daily dkms on the non-working one to rule out differences between the non-working and working one. 
Then post another alsa-info with dump_coef on. Thanks!

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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:
  Confirmed
Status in alsa-driver package in Ubuntu:
  Confirmed

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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