Public bug reported:

when played sound get distorted and when sound is stopped the distortion
continues for a few seconds then stops

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: alsa-base 1.0.24+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  nicolas    1520 F.... pulseaudio
 /dev/snd/controlC1:  nicolas    1520 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xdb100000 irq 47'
   Mixer name   : 'IDT 92HD75B3X5'
   Components   : 'HDA:111d7603,103c3659,00100202'
   Controls      : 20
   Simple ctrls  : 12
Card1.Amixer.info:
 Card hw:1 'S51'/'Creative Technology SB X-Fi Surround 5.1 at 
usb-0000:00:1d.0-1.1, full speed'
   Mixer name   : 'USB Mixer'
   Components   : 'USB041e:3042'
   Controls      : 1
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'Power LED',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Card2.Amixer.info:
 Card hw:2 'NVidia'/'HDA NVidia at 0xd3000000 irq 16'
   Mixer name   : 'Nvidia GPU 0a HDMI/DP'
   Components   : 'HDA:10de000a,10de0101,00100100'
   Controls      : 16
   Simple ctrls  : 4
Date: Fri Jun 17 18:51:39 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:S51 failed
Symptom_Card: High Definition Audio Controller - HDA NVidia
Symptom_Type: Digital clip or distortion, or "overdriven" sound
Title: [USB-Audio - SB X-Fi Surround 5.1, playback] Sound is distorted
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/06/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.17
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 3659
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 32.24
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.17:bd02/06/2010:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr049C210000241310000020000:rvnHewlett-Packard:rn3659:rvr32.24:cvnHewlett-Packard:ct10:cvrN/A:
dmi.product.name: HP Pavilion dv6 Notebook PC
dmi.product.version: 049C210000241310000020000
dmi.sys.vendor: Hewlett-Packard

** Affects: ubuntu
     Importance: Undecided
         Status: New


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

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https://bugs.launchpad.net/bugs/798795

Title:
  [USB-Audio - SB X-Fi Surround 5.1, playback] Sound is distorted

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