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[DJDB <995090@xxxxxxxxxxxxxxxxxx>]

Same problem here. This is the only workaround that works for me:

http://ubuntuforums.org/showthread.php?t=2292143&p=13345100#post13345100

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https://bugs.launchpad.net/bugs/995090

Title:
  [USB-Audio - USB Audio CODEC, playback] Underruns, dropouts or
  crackling sound

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  ubuntu 12.04

  behringer uca222 usb audio device: 
  crackle in output. increases when watching flash video in fullscreen mode. 

  internal HDA Intel device: 
  works fine

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  Uname: Linux 3.2.0-24-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: i386
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xac300000 irq 46'
     Mixer name	: 'Realtek ALC883'
     Components	: 'HDA:10ec0883,10711635,00100002 HDA:14f12c06,14f10000,00100000'
     Controls      : 35
     Simple ctrls  : 18
  Card1.Amixer.info:
   Card hw:1 'CODEC'/'Burr-Brown from TI USB Audio CODEC at usb-0000:00:1d.0-2, full speed'
     Mixer name	: 'USB Mixer'
     Components	: 'USB08bb:2902'
     Controls      : 2
     Simple ctrls  : 1
  Date: Sat May  5 16:02:24 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:CODEC failed
  Symptom_Card: PCM2902 Audio Codec - USB Audio CODEC
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [USB-Audio - USB Audio CODEC, playback] Underruns, dropouts or crackling sound
  UpgradeStatus: Upgraded to precise on 2012-04-28 (6 days ago)
  dmi.bios.date: 08/14/2006
  dmi.bios.vendor: INSYDE
  dmi.bios.version: R1.00
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: MTC
  dmi.board.vendor: MTC
  dmi.board.version: Base Board Version
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: MTC
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnINSYDE:bvrR1.00:bd08/14/2006:svnMTC:pnMTC:pvr1:rvnMTC:rnMTC:rvrBaseBoardVersion:cvnMTC:ct1:cvrChassisVersion:
  dmi.product.name: MTC
  dmi.product.version: 1
  dmi.sys.vendor: MTC

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