constant crackling from built in speakers sony vaio

[uMac]

I can hear constant crackling from built in speakers. Changing output/input device to USB headphones nor muting all devices help to stop it. When I play sound (any video or audio player) crackling intercepts the sound but only if output device is built in audio. If output device is USB headphones, sounds plays smoothly but cracking continues on built in speakers. I read and tried several option or fixes suggested by people on forums however nothing seems to help. My laptop is Sony Vaio VGN-SZ4vWN/X. Crackling is in frequency (slightly less) and randomness like it was used as telegraph machine. Although not too loud you can imagine how annoying this is.
Thanks

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-23-generic 2.6.32-23.37
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-23-generic i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: stan 1782 F.... pulseaudio
 /dev/snd/controlC0: stan 1782 F.... pulseaudio
 /dev/snd/pcmC0D0p: stan 1782 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf8500000 irq 21'
   Mixer name : 'SigmaTel STAC9872AK'
   Components : 'HDA:83847662,104d0700,00100201 HDA:14f12bfa,104d0200,00090000'
   Controls : 11
   Simple ctrls : 7
Card1.Amixer.info:
 Card hw:1 'Headset'/'Logitech Logitech USB Headset at usb-0000:00:1d.7-2.2, full speed'
   Mixer name : 'USB Mixer'
   Components : 'USB046d:0a0b'
   Controls : 6
   Simple ctrls : 2
Date: Mon Jul 19 21:56:58 2010
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=b8779166-1487-4994-afd9-9fdf6329c96a
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: Sony Corporation VGN-SZ4VWN_X
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-23-generic root=UUID=4aeea7e4-0ddc-424e-92c2-571346af5e19 ro acpi_backlight=vendor quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34.1
SourcePackage: linux
dmi.bios.date: 04/12/2007
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R0112N0
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrR0112N0:bd04/12/2007:svnSonyCorporation:pnVGN-SZ4VWN_X:pvrJ0025HQM:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VGN-SZ4VWN_X
dmi.product.version: J0025HQM
dmi.sys.vendor: Sony Corporation

[Jeremy Foshee (jeremyfoshee)]

Hi uvaio,

If you could also please test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

    [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

[uMac (uvaio)]

Hi, I moved power cable away from laptop case one day and it seems to be gone. sorry for bothering, this is so ridiculous to do construction of laptop and not to protect speakers against power interfering. I spent ages to fight this thinking its software problem.