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[smogsy <smogsy@xxxxxxxxx>]

i have seen this on 14.04 & 14.10

Running Google Music from FireFox to Arcam Irdac.

It ran fine for around 12 minutes then after a track change it turned
into cracking due to high volume sounded like it was going to crack my
speakers.

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Touch seeded packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1414402

Title:
  [USB-Audio - USB Audio DAC, playback] Ocassional crackling, rarer
  light hissing in one of the two channels

Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  I see this output from "pulseaudio," but nothing is logged when the
  sound crackles:

  W: [pulseaudio] sink.c: Default and alternate sample rates are the same.
  W: [pulseaudio] source.c: Default and alternate sample rates are the same.
  E: [alsa-sink-Intel ICH] alsa-sink.c: ALSA woke us up to write new data to the device, but there was actually nothing to write!
  E: [alsa-sink-Intel ICH] alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_intel8x0'. Please report this issue to the ALSA developers.
  E: [alsa-sink-Intel ICH] alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
  W: [alsa-sink-USB Audio] protocol-native.c: Failed to push data into queue

  This is all with default settings.  Disabling the Pulse Audio
  scheduler doesn't help.  The audio output should be flawless.  It's
  practically impossible to figure out ALSA, even with the Internet.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: pulseaudio 1:4.0-0ubuntu11
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  westonlast   3706 F.... pulseaudio
                        westonlast   6055 F.... pulseaudio
   /dev/snd/controlC1:  westonlast   3706 F.... pulseaudio
                        westonlast   6055 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Jan 25 01:33:09 2015
  InstallationDate: Installed on 2014-10-03 (114 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
  SourcePackage: pulseaudio
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:DAC successful
  Symptom_Card: USB Audio DAC    - USB Audio DAC
  Symptom_PulsePlaybackTest: PulseAudio playback test failed
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [USB-Audio - USB Audio DAC, playback] Underruns, dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/03/2006
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1204
  dmi.board.asset.tag: alienware
  dmi.board.name: A8N32-SLI-Deluxe
  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: alienware
  dmi.chassis.version: alienware
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1204:bd04/03/2006:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnA8N32-SLI-Deluxe:rvrRev1.xx:cvnalienware:ct3:cvralienware:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  modified.conffile..etc.pulse.default.pa: [modified]
  mtime.conffile..etc.pulse.default.pa: 2015-01-24T22:30:13.991660

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