It _may_ be triggered by suspending/resuming, but definitely not in a 
systematic manner.
I suspend and resume all the time and have only observed this issue in few 
occasions.

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https://bugs.launchpad.net/bugs/1126702

Title:
  Sound balance moves to the right by itself without a reason

Status in “pulseaudio” package in Ubuntu:
  Confirmed

Bug description:
  I have no idea which package this bug belongs to.

  This is the second time i experience this.

  - I have external speakers connected to the hearphones plug of my laptop. 
Normally everything works fine.
  - All of a sudden, all sound seems to come only from the right channel, so I 
start checking my speakers and connections and everything's ok
  - Then I open Sound Settings; It shows the settings for "headphones".  The 
"balance" setting is at center; yet if I go to "test sound" and I click the 
left "test" button i hear nothing (when I click the right test button I hear 
sound from the right).
  - I unplug the external speakers. Now the settings for "speakers" (meaning 
laptop's built-in speakers) show up. I do some tests and everything's fine
  - I plug the external speakers again. Now the settings for "headphones" show 
up again, and this time I can see that the balance is moved all the way to the 
right!!!!!!
  - I move it to the center and now everything works fine.

  So there are two bugs:
  1. the setting for sound balance changes on its own initiative and moves 
itself all the way to the right without me having touched anything
  2. in the sound settings window it doesn't show up correctly: it shows up as 
centered even if it is all the way to the right. Only after unplugging and 
replugging headphones it shows the actual value

  
  I know it sound CRAZY but it is exactly what happened. It's the second time, 
so it's definitely real.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: pulseaudio 1:2.1-0ubuntu4
  ProcVersionSignature: Ubuntu 3.5.0-23.35-generic 3.5.7.2
  Uname: Linux 3.5.0-23-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  teo        2636 F.... pulseaudio
   /dev/snd/pcmC0D0p:   teo        2636 F...m pulseaudio
  Date: Fri Feb 15 23:26:38 2013
  InstallationDate: Installed on 2010-06-23 (968 days ago)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: pulseaudio
  UpgradeStatus: Upgraded to quantal on 2013-01-13 (33 days ago)
  dmi.bios.date: 12/24/2007
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 303
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: M51Sn
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr303:bd12/24/2007:svnASUSTeKComputerInc.:pnM51Sn:pvr1.0:rvnASUSTeKComputerInc.:rnM51Sn:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: M51Sn
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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