5.1 audio output constans buzzing, beeping

[aurin]

Binary package hint: pulseaudio

Hi!

It's a problem since Ubuntu 9.10.
If the audio output set to 5.1, you can hear a constant buzzing, beeping
in the background. (The volume of this buzzing is changing when setting
the output volume. It have a circular pattern: first the buzzing is low, then
louder when you increase the output volume, then you give more output
volume and the buzzing is low again, and so on...)
(If you change the output to 2.0, then no buzzing, but it's useless because
of the subwoofer and 2.0 isn't 5.1)
Under Ubuntu 9.04 work almost fine and under other operating systems
(like Win7) it's work also fine, so there is no problem with the hardware.

Thanks you for your help (and sorry if my english is not so good).

Bye

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-generic i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: aurin 1514 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf9ff8000 irq 22'
   Mixer name : 'Realtek ALC1200'
   Components : 'HDA:10ec0888,104382fe,00100101'
   Controls : 40
   Simple ctrls : 22
Date: Sun Apr 11 22:31:06 2010
ProcEnviron:
 LANG=hu_HU.utf8
 SHELL=/bin/bash
SourcePackage: pulseaudio
dmi.bios.date: 04/07/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2102
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5Q
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2102:bd04/07/2009:svnSystemmanufacturer:pnP5Q:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5Q:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: P5Q
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer