Public bug reported:

editing the /etc/modprobe.d/alsa-base.conf file and adding

options snd-hda-intel position_fix=1

solved the problem.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: alsa-base 1.0.25+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic 3.2.18
Uname: Linux 3.2.0-25-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  enboig     3216 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xf1b00000 irq 26'
   Mixer name   : 'Realtek ALC269VB'
   Components   : 'HDA:10ec0269,102804c4,00100100'
   Controls      : 20
   Simple ctrls  : 12
Date: Fri Jul  6 00:40:33 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=ca_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: So integrat - HDA Intel PCH
Symptom_Jack: Pink Mic, Left
Symptom_Type: Volume slider, or mixer problems
Title: [Dell System Inspiron N7110, Realtek ALC269VB, Pink Mic, Left] volume 
slider problem
UpgradeStatus: Upgraded to precise on 2012-04-29 (67 days ago)
dmi.bios.date: 02/22/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0FRK44
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: 
dmi:bvnDellInc.:bvrA12:bd02/22/2012:svnDellInc.:pnDellSystemInspironN7110:pvr:rvnDellInc.:rn0FRK44:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System Inspiron N7110
dmi.sys.vendor: Dell Inc.
mtime.conffile..etc.modprobe.d.alsa.base.conf: 2012-07-06T00:23:22.585645

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


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/1021504

Title:
  [Dell System Inspiron N7110, Realtek ALC269VB] noise when sound starts

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