Public bug reported:

Sound just stopped working in Oneiric.  Was working consistently just
yesterday without crackling or dropouts. Now I have both through the
spdif connection.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: alsa-base 1.0.24+dfsg-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  alex       2064 F.... pulseaudio
 /dev/snd/controlC0:  alex       2064 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xf9ef4000 irq 16'
   Mixer name   : 'VIA VT1708S'
   Components   : 'HDA:11060397,18490397,00100000'
   Controls      : 36
   Simple ctrls  : 20
Card1.Amixer.info:
 Card hw:1 'U0x46d0x809'/'USB Device 0x46d:0x809 at usb-0000:00:13.2-4, high 
speed'
   Mixer name   : 'USB Mixer'
   Components   : 'USB046d:0809'
   Controls      : 2
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
   Capture channels: Mono
   Limits: Capture 0 - 6400
   Mono: Capture 4608 [72%] [24.00dB] [on]
CheckboxSubmission: 9feeb0f9e907bf4140485e22db110c07
CheckboxSystem: 0531969bcfd4f03af7405c98dc94a948
Date: Wed Jan 11 00:32:38 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:SB failed
Symptom_Card: Internal Audio - HDA ATI SB
Symptom_Jack: Black SPDIF Out, Rear Panel
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [To Be Filled By O.E.M., VIA VT1708S, Black SPDIF Out, Rear Panel] 
Underruns, dropouts or crackling sound
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/07/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.70
dmi.board.name: M3A770DE
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.70:bd09/07/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnM3A770DE:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

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


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

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https://bugs.launchpad.net/bugs/914593

Title:
  [To Be Filled By O.E.M., VIA VT1708S, Black SPDIF Out, Rear Panel]
  Underruns, dropouts or crackling sound

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