Public bug reported:

crackling sound

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: alsa-base 1.0.24+dfsg-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic-pae 3.0.6
Uname: Linux 3.0.0-13-generic-pae i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  vero       1733 F.... pulseaudio
 /dev/snd/controlC1:  vero       1733 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Creative'/'HDA Creative at 0xfba00000 irq 19'
   Mixer name   : 'Creative CA0110-IBG'
   Components   : 'HDA:1102000a,11021007,00100000'
   Controls      : 25
   Simple ctrls  : 11
Card1.Amixer.info:
 Card hw:1 'U0x46d0x9a4'/'USB Device 0x46d:0x9a4 at usb-0000:00:1d.0-1.6.4, 
high speed'
   Mixer name   : 'USB Mixer'
   Components   : 'USB046d:09a4'
   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 - 3072
   Mono: Capture 0 [0%] [23.00dB] [on]
Date: Sat Nov  5 22:33:36 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Creative successful
Symptom_Card: [SB X-Fi Xtreme Audio] CA0110-IBG - HDA Creative
Symptom_Jack: Green Line Out, Rear
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [Precision T1500, Creative CA0110-IBG, Green Line Out, Rear] Underruns, 
dropouts or crackling sound
UpgradeStatus: Upgraded to oneiric on 2011-10-22 (14 days ago)
dmi.bios.date: 09/18/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.0.1
dmi.board.name: 0P67HD
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.0.1:bd09/18/2009:svnDellInc.:pnPrecisionT1500:pvr00:rvnDellInc.:rn0P67HD:rvrA00:cvnDellInc.:ct3:cvr:
dmi.product.name: Precision T1500
dmi.product.version: 00
dmi.sys.vendor: Dell Inc.

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


** Tags: apport-bug i386 oneiric

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https://bugs.launchpad.net/bugs/886682

Title:
  [Precision T1500, Creative CA0110-IBG, Green Line Out, Rear]
  Underruns, dropouts or crackling sound

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