Public bug reported:

I'm getting an annoyingn noise from my HP Paviliion dv6000 computer when
no sound is being played. When I increase, decrease, or mute the volume,
I get a cracking noise. Then, the idling noise will return. Thanks for
any tips you may have!

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: alsa-base 1.0.25+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-34.53-generic 3.2.33
Uname: Linux 3.2.0-34-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu12
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  kharisma   1683 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd8240000 irq 43'
   Mixer name   : 'Conexant CX20549 (Venice)'
   Components   : 'HDA:14f15045,103c30bb,00100100'
   Controls      : 18
   Simple ctrls  : 9
Date: Sat Dec 15 12:13:54 2012
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 
(20120817.3)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel successful
Symptom_Card: Built-in Audio - HDA Intel
Symptom_Jack: Speaker, Internal
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [HP Pavilion dv6000 (RV216UA#ABA), Conexant CX20549 (Venice), Speaker, 
Internal] Underruns, dropouts or crackling sound
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/26/2008
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.2D
dmi.board.name: 30BB
dmi.board.vendor: Quanta
dmi.board.version: 66.42
dmi.chassis.type: 10
dmi.chassis.vendor: Quanta
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.2D:bd11/26/2008:svnHewlett-Packard:pnHPPaviliondv6000(RV216UA#ABA):pvrRev1:rvnQuanta:rn30BB:rvr66.42:cvnQuanta:ct10:cvrN/A:
dmi.product.name: HP Pavilion dv6000 (RV216UA#ABA)
dmi.product.version: Rev 1
dmi.sys.vendor: Hewlett-Packard

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 precise running-unity

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https://bugs.launchpad.net/bugs/1090758

Title:
  [HP Pavilion dv6000 (RV216UA#ABA), Conexant CX20549 (Venice), Speaker,
  Internal] Noise when sound isn't being played

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