Public bug reported:

I do not believe it is an issue with the hardware, because I tried
dualbooting into Windows 7 and was able to record sounds without any of
these issues at all.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pulseaudio 1:1.1-0ubuntu15.2 [modified: 
usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf]
ProcVersionSignature: Ubuntu 3.2.0-37.58-generic 3.2.35
Uname: Linux 3.2.0-37-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 1: Generic_1 [HD-Audio Generic], device 0: STAC92xx Analog [STAC92xx 
Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  eric       3857 F.... pulseaudio
 /dev/snd/controlC0:  eric       3857 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Generic'/'HD-Audio Generic at 0xf0344000 irq 52'
   Mixer name   : 'ATI R6xx HDMI'
   Components   : 'HDA:1002aa01,00aa0100,00100200'
   Controls      : 6
   Simple ctrls  : 1
Card0.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Card1.Amixer.info:
 Card hw:1 'Generic_1'/'HD-Audio Generic at 0xf0340000 irq 16'
   Mixer name   : 'IDT 92HD81B1X5'
   Components   : 'HDA:111d7605,103c358b,00100105'
   Controls      : 16
   Simple ctrls  : 9
Date: Fri Feb 15 19:04:40 2013
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120823.1)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
Symptom: audio
Symptom_AlsaRecordingTest: ALSA recording test through plughw:Generic_1 
successful
Symptom_Card: Built-in Audio - HD-Audio Generic
Symptom_Jack: Mic, Top
Symptom_PulseAudioRecordingTest: PulseAudio recording test through 
plughw:Generic_1 failed
Symptom_Type: High background noise, or volume is too low
Title: [HP Pavilion dv6 Notebook PC, IDT 92HD81B1X5, Mic, Top] Background noise 
or low volume
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/22/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.1A
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 1805
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 33.58
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.1A:bd06/22/2012:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr0690210000204710000620100:rvnHewlett-Packard:rn1805:rvr33.58:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion dv6 Notebook PC
dmi.product.version: 0690210000204710000620100
dmi.sys.vendor: Hewlett-Packard

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise running-unity

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https://bugs.launchpad.net/bugs/1126797

Title:
  [HP Pavilion dv6 Notebook PC, IDT 92HD81B1X5, Mic, Top] Background
  noise or low volume

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