This seems to have gotten fixed with an update.
** Changed in: alsa-driver (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1213769
Title:
[ASUS P8Z68-V PRO, Realtek ALC892, Green Line Out, Rear] Popping sound
or crackle every few seconds while playing audio
Status in “alsa-driver” package in Ubuntu:
Fix Released
Bug description:
Recent regression.
Options snd-hda-intel position_fix=2 makes the pop sound a little
softer, but does not eliminate it.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.11.0-2.5-generic 3.11.0-rc5
Uname: Linux 3.11.0-2-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: omer 3421 F.... pulseaudio
/dev/snd/controlC1: omer 3421 F.... pulseaudio
/dev/snd/controlC0: omer 3421 F.... pulseaudio
/dev/snd/pcmC0D0p: omer 3421 F...m pulseaudio
Date: Sun Aug 18 23:26:33 2013
InstallationDate: Installed on 2013-07-05 (44 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130704)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Green Line Out, Rear
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [System Product Name, Realtek ALC892, Green Line Out, Rear] Underruns,
dropouts or crackling sound
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/09/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0501
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8Z68-V PRO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0501:bd05/09/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
mtime.conffile..etc.modprobe.d.alsa.base.conf: 2013-08-18T23:23:04.428117
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