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[Andrei Costescu <costescuandrei@xxxxxxxxxx>]

I have the same thing happening on Ubuntu 14.04. Identical; popping and
when that happens volume goes for a few millisecs to another level then
back. In the audio settings, analogue output dissapears exactly when the
sound pops and reappears immediately.

As the initial poster mentioned on the forum, if I plug the speakers/headphones in the front jack of the PC it works normally - no popping. So popping only happens when only back side jack is used with speakers.
Forum post: http://ubuntuforums.org/showthread.php?t=2245429

For example if I have speakers conncted to back jack and headphones to front jack sound also works normally in both.
Is this a hardware (front jack malfunction) or software problem? Should I go back to the store and ask for replacements?

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https://bugs.launchpad.net/bugs/1353013

Title:
  Popping/Crackling sound when playing audio in Ubuntu 14.04

Status in nvidia-hdmi-pulseaudio package in Ubuntu:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  When listening to audio (pandora internet radio, youtube, etc.), I get
  a repeated popping/crackling sound. When I look at the sound settings
  while this is happening, I see "Headphone Output" rapidly appearing
  and then disappearing in the "Play Sound Through" section. The
  appearance and disappearance of "Headphone Output" coincides with the
  popping and crackling of the sound.

  I am wondering if it has anything to do with the fact that my Nvidia
  card has a built-in HDMI card that might be interfering with my
  onboard sound:

  $ cat /proc/asound/cards
   0 [PCH ]: HDA-Intel - HDA Intel PCH
                        HDA Intel PCH at 0xf7220000 irq 54
   1 [NVidia ]: HDA-Intel - HDA NVidia
                        HDA NVidia at 0xf7080000 irq 55
  cat /proc/asound/modules
   0 snd_hda_intel
   1 snd_hda_intel

  Obviously blacklisting "snd_hda_intel" in
  /etc/modprobe.d/blacklist.conf won't work, because it then disables
  all sound (both onboard and nvidia are listed as snd_hda_intel).

  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: pulseaudio 1:4.0-0ubuntu11
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tim        1856 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Aug  5 10:17:34 2014
  InstallationDate: Installed on 2014-04-17 (109 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/07/2011
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: BLH6710H.86A.0132.2011.1007.1505
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: DH67CL
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAG10212-205
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrBLH6710H.86A.0132.2011.1007.1505:bd10/07/2011:svn:pn:pvr:rvnIntelCorporation:rnDH67CL:rvrAAG10212-205:cvn:ct3:cvr:
  modified.conffile..etc.pulse.daemon.conf: [modified]
  modified.conffile..etc.pulse.default.pa: [modified]
  mtime.conffile..etc.pulse.daemon.conf: 2014-08-04T12:00:53.999120
  mtime.conffile..etc.pulse.default.pa: 2014-08-04T12:18:08.532386

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