Public bug reported:

No sound, i don't know the origin or why it started, i don't rtemeber of
any even causing the problem ...

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: alsa-base 1.0.25+dfsg-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.2.0-52.78-generic 3.2.48
Uname: Linux 3.2.0-52-generic i686
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  benji     12814 F.... pulseaudio
 /dev/snd/pcmC0D1p:   benji     12814 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0x90500000 irq 45'
   Mixer name   : 'SigmaTel STAC9221 A1'
   Components   : 'HDA:83847680,106b1700,00103401'
   Controls      : 24
   Simple ctrls  : 13
Date: Mon Sep 23 18:36:15 2013
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
MarkForUpload: True
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 failed
Symptom_Card: Built-in Audio - HDA Intel
Symptom_DevicesInUse:
 12814  1420/dev/snd/controlC0:  benji     F.... pulseaudio
 /dev/snd/seq:        timidity  F.... timidity
Symptom_Jack: White Speaker, Internal
Symptom_Type: No sound at all
Title: [iMac5,1, SigmaTel STAC9221 A1, White Speaker, Internal] No sound at all
UpgradeStatus: Upgraded to precise on 2013-07-07 (78 days ago)
dmi.bios.date: 06/27/07
dmi.bios.vendor: Apple Computer, Inc.
dmi.bios.version: IM51.88Z.0090.B09.0706270921
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Mac-F4228EC8
dmi.board.vendor: Apple Computer, Inc.
dmi.board.version: DVT
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 13
dmi.chassis.vendor: Apple Computer, Inc.
dmi.chassis.version: Mac-F4228EC8
dmi.modalias: 
dmi:bvnAppleComputer,Inc.:bvrIM51.88Z.0090.B09.0706270921:bd06/27/07:svnAppleComputer,Inc.:pniMac5,1:pvr1.0:rvnAppleComputer,Inc.:rnMac-F4228EC8:rvrDVT:cvnAppleComputer,Inc.:ct13:cvrMac-F4228EC8:
dmi.product.name: iMac5,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Computer, Inc.

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


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

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https://bugs.launchpad.net/bugs/1229473

Title:
   iMac5,1, SigmaTel STAC9221 A1, White Speaker, Internal  No sound at
  all

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