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[mmalmeida <874535@xxxxxxxxxxxxxxxxxx>]

Same started happening to me when I add a device to the headphones jack.

I tried kolobok-not-dead 's suggestion. Flickering disappears, but unfortunately the mixer's volume cannot be changed. 
@kolobok-not-dead - did you have that? Does it have to do with the kmix? (trying to find kmix's equivalent in unity)

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https://bugs.launchpad.net/bugs/874535

Title:
  Volume Slider Jumps, due to rapidly changing hardware jack sense state

Status in alsa-driver package in Ubuntu:
  Triaged

Bug description:
  In Oneiric Release,  The volume slider randomly jump down a notch or
  two for fraction of  a second, even when there is no audio playing on
  the system.  If mute is selected, the menu will quickly flip out of
  mute mode and back again.  This change actually affects the audio
  output, resulting in pops correlated with the volume changes.

  nVidia GF106 Audio Controller
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC892 Analog [ALC892 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jfrorie    9959 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfb9f8000 irq 54'
     Mixer name	: 'Realtek ALC892'
     Components	: 'HDA:10ec0892,1462522c,00100302'
     Controls      : 35
     Simple ctrls  : 20
  Card2.Amixer.info:
   Card hw:2 'Generic'/'HD-Audio Generic at 0xfbcf8000 irq 55'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 4
     Simple ctrls  : 1
  Card2.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  DistroRelease: Ubuntu 11.10
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  Package: pulseaudio 1:1.0-0ubuntu3.1
  PackageArchitecture: amd64
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
  Tags:  oneiric running-unity
  Uname: Linux 3.0.0-14-generic x86_64
  UpgradeStatus: Upgraded to oneiric on 2011-10-14 (82 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 11/16/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V25.0
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: X58A-GD45 (MS-7522)
  dmi.board.vendor: MSI
  dmi.board.version: 5.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
  dmi.chassis.version: 5.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV25.0:bd11/16/2010:svnMSI:pnMS-7522:pvr5.0:rvnMSI:rnX58A-GD45(MS-7522):rvr5.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr5.0:
  dmi.product.name: MS-7522
  dmi.product.version: 5.0
  dmi.sys.vendor: MSI

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