On this same motherboard (Gigabyte GA-MA74GMT-S2), I had success getting
the front panel input to work by adding the following line to
/etc/pulse/default.pa

load-module module-alsa-source device=hw:0,0


I added this just before the udev auto-detect module:

### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect
.else

Then run: /etc/init.d/pulseaudio restart

If you still get no sound input:

1. Run alsamixer
2. Press F4 to go to the Capture screen
3. Right Arrow over to the "Input Source" column
4. Press Up/Down Arrow until the "Front Mic" input is selected
5. Make sure your Capture volume is all the way up (adjust Mic Boost to taste 
but beware if it's too high you'll get distortion)

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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/1004829

Title:
  [GA-MA74GMT-S2, Realtek ALC887-VD, Pink Mic, Front] No sound at all

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

Bug description:
  Mic doesn't work on Ubuntu 12.04

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  srinivas   2967 F.... pulseaudio
   /dev/snd/controlC0:  srinivas   2967 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'SB'/'HDA ATI SB at 0xfe024000 irq 16'
     Mixer name : 'Realtek ALC887-VD'
     Components : 'HDA:10ec0887,1458a002,00100302'
     Controls      : 42
     Simple ctrls  : 21
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xfcffc000 irq 19'
     Mixer name : 'Nvidia GPU 0b HDMI/DP'
     Components : 'HDA:10de000b,10de0101,00100200'
     Controls      : 24
     Simple ctrls  : 4
  Date: Sat May 26 14:20:32 2012
  InstallationMedia: Ubuntu-Server 11.10 "Oneiric Ocelot" - Release amd64 
(20111011)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:SB failed
  Symptom_Card: Built-in Audio - HDA ATI SB
  Symptom_DevicesInUse:
   2967  2967  srinivas  F.... pulseaudio
   /dev/snd/controlC0:  srinivas  F.... pulseaudio
  Symptom_Jack: Pink Mic, Front
  Symptom_Type: No sound at all
  Title: [GA-MA74GMT-S2, Realtek ALC887-VD, Pink Mic, Front] No sound at all
  UpgradeStatus: Upgraded to precise on 2012-04-27 (29 days ago)
  dmi.bios.date: 08/31/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F10
  dmi.board.name: GA-MA74GMT-S2
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF10:bd08/31/2010:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA74GMT-S2:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA74GMT-S2:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-MA74GMT-S2
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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