Popping/Crackling sound when playing audio in Ubuntu 14.04

[Tim Wernicke]

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).

Additional Info:
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

[Tim Wernicke (pprspam)]

Raymond, what can I do to provide more info? I see you marked it as incomplete, but you didn't mention what information you need.

[Tim Wernicke (pprspam)]

Nevermind, I made a new report using "ubuntu-bug" to provide more comprehensive info. Please close this bug and refer to bug #1353013 instead.