Public bug reported:

Sound is low and consist of noise.
Also, no sound coming from youtube (online source) from the firefox browser 
(video is working fine).

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
Uname: Linux 3.13.0-36-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  ak         2085 F.... pulseaudio
 /dev/snd/controlC0:  ak         2085 F.... pulseaudio
 /dev/snd/pcmC0D3p:   ak         2085 F...m pulseaudio
CurrentDesktop: Unity
Date: Sun Oct  5 17:02:14 2014
InstallationDate: Installed on 2013-11-13 (325 days ago)
InstallationMedia: Ubuntu 10.04.3 LTS "Lucid Lynx" - Release amd64 (20110720.1)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Generic failed
Symptom_Card: Built-in Audio - HD-Audio Generic
Symptom_Jack: Digital Out, HDMI
Symptom_Type: High background noise, or volume is too low
Title: [HP Pavilion g4 Notebook PC, ATI R6xx HDMI, Digital Out, HDMI] 
Background noise or low volume
UpgradeStatus: Upgraded to trusty on 2014-08-30 (36 days ago)
dmi.bios.date: 04/17/2013
dmi.bios.vendor: Insyde
dmi.bios.version: F.69
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 3564
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 21.46
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnInsyde:bvrF.69:bd04/17/2013:svnHewlett-Packard:pnHPPaviliong4NotebookPC:pvr0695130000004610000600000:rvnHewlett-Packard:rn3564:rvr21.46:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion g4 Notebook PC
dmi.product.version: 0695130000004610000600000
dmi.sys.vendor: Hewlett-Packard

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


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1377604

Title:
  [HP Pavilion g4 Notebook PC, ATI R6xx HDMI, Digital Out, HDMI]
  Background noise or low volume

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