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[Marcelo Alcocer <marsehole@xxxxxxxxx>]

Had the same issue with an ASUS S551LN (Realtek ALC233, Internal Mic, combo microphone/headphone jack).
After playing around a lot, the following settings in the alsamixer finally seemed to do the trick:

1) Playback->Mic: 100%
2) Playback->Mic Boost: 0%
3) Capture->Capture: 100%
4) Capture->Mic Boost: 0%

This resulted in what looked like a very low mic level in pulseaudio,
but the internal mic works fine. Changing any mic setting from
pulseaudio immediately increases the boost in alsamixer and kills mic
input.

Hope it's of some use

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1334617

Title:
  [X550LB, Realtek ALC233, Mic, Internal] not working Ubuntu 14.04

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

Bug description:
  http://www.alsa-
  project.org/db/?f=70fd0de0d58f680c5a74ff1fbcf6dc46de5e5dc8

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alexander   2433 F.... pulseaudio
   /dev/snd/controlC1:  alexander   2433 F.... pulseaudio
                        alexander   3242 F.... alsamixer
  CurrentDesktop: Unity
  Date: Thu Jun 26 13:22:07 2014
  InstallationDate: Installed on 2014-06-23 (3 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH failed
  Symptom_Card: Встроенное аудио - HDA Intel PCH
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alexander   2433 F.... pulseaudio
   /dev/snd/controlC1:  alexander   2433 F.... pulseaudio
                        alexander   3242 F.... alsamixer
  Symptom_Jack: Mic, Internal
  Symptom_Type: No sound at all
  Title: [X550LB, Realtek ALC233, Mic, Internal] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/19/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X550LB.402
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X550LB
  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.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550LB.402:bd11/19/2013:svnASUSTeKCOMPUTERINC.:pnX550LB:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550LB:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X550LB
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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