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[Sergio Benjamim <sergio_br2@xxxxxxxxxxxx>]

I'm having this issue too in xubuntu 14.04.1. It often happens when I'm
using Alsa, and it is random, sometimes audio works well but then all of
a sudden it gets this repeated popping/crackling sound.

When in the normal audio, top shows pulseaudio with 3~5% of CPU usage
and pavucontrol with 9~10%, and pavucontrol is like the attach picture.


** Attachment added: "pavucontrol with normal audio"
   https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1353013/+attachment/4250420/+files/Normal%20Audio.png

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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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