did you record in stereo or mono when using audacity ?

are the left and right channels out of phase for your digital mic ?

Node 0x12 [Pin Complex] wcaps 0x40040b: Stereo Amp-In
  Control: name="Internal Mic Boost Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Internal Mic Phantom Jack", index=0, device=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x03 0x03]
  Pincap 0x00000020: IN
  Pin Default 0x90a60140: [Fixed] Mic at Int N/A
    Conn = Digital, Color = Unknown
    DefAssociation = 0x4, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x20: IN
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0

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https://bugs.launchpad.net/bugs/1253803

Title:
  [2436CTR, Realtek ALC269VC, Mic, Internal] No sound at all

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

Bug description:
  Xubuntu 13.10
  All settings of alsamixer set to max volume including microphone boost.
  Internal mic tested with Audacity and Skype
  Absolutely no sound appears to be recorded

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  david      1447 F.... pulseaudio
   /dev/snd/controlC0:  david      1447 F.... pulseaudio
  Date: Thu Nov 21 14:18:29 2013
  InstallationDate: Installed on 2013-11-21 (0 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  david      1447 F.... pulseaudio
   /dev/snd/controlC0:  david      1447 F.... pulseaudio
  Symptom_Jack: Mic, Internal
  Symptom_Type: No sound at all
  Title: [2436CTR, Realtek ALC269VC, Mic, Internal] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/09/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G5ET33WW (1.11 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2436CTR
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrG5ET33WW(1.11):bd08/09/2012:svnLENOVO:pn2436CTR:pvrThinkPadW530:rvnLENOVO:rn2436CTR:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2436CTR
  dmi.product.version: ThinkPad W530
  dmi.sys.vendor: LENOVO

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