high pitched rattling/whine artifacts when 5.1 surround is enabled.

[mitch]

Binary package hint: pulseaudio

A high pitched rattle/whine is emitted from the speakers constantly when using 5.1 surround. The problem occurs when sound is played on native system applications but does not occur when sound is played from a web browser. For instance when listening to music on Rythymbox the problem always occurs but when I'm streaming a song from playlist.com it never occurs. Also the problem can be fixed by simply turning off 5.1 and reverting to a regular 2 speaker w/woofer setup. I am using Lucid 10.04 and the system is kept fully updated. My sound card is an X-Fi Titanium Champion Series. This problem is not unique to me as I have seen bug reports for older versions of Ubuntu when goggling for solutions to this issue, here are some other bug reports filed regarding this http://bit.ly/bzyTUf

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14
ProcVersionSignature: Ubuntu 2.6.32-24.42-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: XFi [Creative X-Fi], device 0: ctxfi [Front/WaveIn]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: sm0ke42o 3304 F.... pulseaudio
 /dev/snd/pcmC0D0p: sm0ke42o 3162 f...m npviewer.bin
Card0.Amixer.info:
 Card hw:0 'XFi'/'Creative X-Fi 20K1 Unknown'
   Mixer name : '20K1'
   Components : ''
   Controls : 30
   Simple ctrls : 11
Date: Sat Sep 4 09:27:29 2010
ExecutablePath: /usr/bin/pulseaudio
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: pulseaudio
dmi.bios.date: 05/11/2010
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 6.00 PG
dmi.board.name: 132-BL-E758
dmi.board.vendor: EVGA
dmi.board.version: Tylersburg
dmi.chassis.type: 3
dmi.chassis.vendor: OEM
dmi.chassis.version: OEM
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd05/11/2010:svnOEM:pnOEM:pvrOEM:rvnEVGA:rn132-BL-E758:rvrTylersburg:cvnOEM:ct3:cvrOEM:
dmi.product.name: OEM
dmi.product.version: OEM
dmi.sys.vendor: OEM