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[Jay <jwdennis3@xxxxxxxxx>]

I have tried both "present" and "not present" for the Jack detection
settings for pin id 0x13 and 0x0e even though 0x13 appears to be the
internal mic.  No changes occur.  Is there another way to change the
misc bit?  I attached a sample audio file taken with full mic boost to
illustrate the problem if interested.

** Attachment added: "test_sample.wav"
   https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1356393/+attachment/4176954/+files/test_sample.wav

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https://bugs.launchpad.net/bugs/1356393

Title:
  [XPS M1330, SigmaTel STAC9228, Mic, Internal] volume too low and
  distorted even with boost

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

Bug description:
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  Dell XPS M1330
  SigmaTel STAC9228
  Internal Microphone

  Problem: The capture volume is so low on the internal microphone (not the jack) that I can barely hear it even with full boost and speaker volume all the way up.  Additionally, the capture has some distortion.  If I tap on the microphone I can hear the taps, so I know that the capture is working; however, it is not functioning in a manner that allows it to be usable.
  Everything else works great, including audio output (I can hear music and sound from videos just fine).
  Additionally, when I boot into windows vista, the microphone works perfectly, so it's not a hardware issue.

  I have scoured the forums trying to find a fix, including trying all
  the different models in alsa-base.conf listed for the STAC9228 and
  trying all sorts of configurations via alsamixer and pavucontrol
  including silencing the left/right channel while leaving the other at
  full volume.  I have even tried alternate configurations via
  hdajackretask.  Thanks for any help you can give.

  jay

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic i686
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jay        1917 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Aug 13 09:54:25 2014
  InstallationDate: Installed on 2014-08-02 (10 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:Intel failed
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_Jack: Mic, Internal
  Symptom_Type: High background noise, or volume is too low
  Title: [XPS M1330, SigmaTel STAC9228, Mic, Internal] Background noise or low volume
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/26/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd12/26/2008:svnDellInc.:pnXPSM1330:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: XPS M1330
  dmi.sys.vendor: Dell Inc.
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2014-08-13T09:42:42.548525

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