Public bug reported:

Sound stopped working after an update -not sure what packages were part
of the upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: alsa-base 1.0.24+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic x86_64
NonfreeKernelModules: nvidia wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: NVidia [HDA NVidia], device 0: Cirrus Analog [Cirrus Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  rgill      5197 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xe7480000 irq 22'
   Mixer name   : 'Cirrus Logic CS4206'
   Components   : 'HDA:10134206,106b4b00,00100301'
   Controls      : 17
   Simple ctrls  : 10
Date: Mon Jul  4 14:47:26 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_IE:en
 PATH=(custom, user)
 LANG=en_IE.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:NVidia failed
Symptom_Card: Internal Audio - HDA NVidia
Symptom_DevicesInUse: 5197
Symptom_Jack: Speaker, Internal
Symptom_Type: No sound at all
Title: [MacBookPro5,3, Cirrus Logic CS4206, Speaker, Internal] No sound at all
UpgradeStatus: Upgraded to natty on 2011-03-04 (122 days ago)
dmi.bios.date: 06/15/09
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP53.88Z.00AC.B03.0906151647
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-F22587C8
dmi.board.vendor: Apple Inc.
dmi.chassis.asset.tag: Asset Tag#
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F22587C8
dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP53.88Z.00AC.B03.0906151647:bd06/15/09:svnAppleInc.:pnMacBookPro5,3:pvr1.0:rvnAppleInc.:rnMac-F22587C8:rvr:cvnAppleInc.:ct10:cvrMac-F22587C8:
dmi.product.name: MacBookPro5,3
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

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


** Tags: amd64 apport-bug natty

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https://bugs.launchpad.net/bugs/805488

Title:
  [MacBookPro5,3, Cirrus Logic CS4206, Speaker, Internal] No sound at
  all

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