Very odd bug.
Appeared again for me >_>
So posting the temporary workaround I found here:
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/751265/comments/23
I guess now I can sleep easy at night :D

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/877509

Title:
  [4286CTO, Creative CA0110-IBG, White Headphone Out, Front] Underruns,
  dropouts or crackling sound

Status in “alsa-driver” package in Ubuntu:
  Confirmed

Bug description:
  Sound is distorted and choppy until I run ubuntu-bug.  This fixes the
  problem until the next reboot when I must do it again.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: alsa-base 1.0.24+dfsg-0ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  alex       1797 F.... pulseaudio
   /dev/snd/controlC0:  alex       1797 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf2520000 irq 44'
     Mixer name : 'Intel CougarPoint HDMI'
     Components : 'HDA:14f1506e,17aa21da,00100000 
HDA:80862805,80860101,00100000'
     Controls      : 20
     Simple ctrls  : 8
  Card1.Amixer.info:
   Card hw:1 'Creative'/'HDA Creative at 0xf1c00000 irq 19'
     Mixer name : 'Creative CA0110-IBG'
     Components : 'HDA:1102000a,11021001,00100000'
     Controls      : 15
     Simple ctrls  : 8
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 
unknown'
     Mixer name : 'ThinkPad EC (unknown)'
     Components : ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Tue Oct 18 11:09:47 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Creative 
successful
  Symptom_Card: [SB X-Fi Xtreme Audio] CA0110-IBG - HDA Creative
  Symptom_Jack: White Headphone Out, Front
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_SpeakerTestPulseStderr: W r i t e   e r r o r :   - 3 2 , B r o k e n 
  p i p e
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [4286CTO, Creative CA0110-IBG, White Headphone Out, Front] Underruns, 
dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/13/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET45WW (1.15 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4286CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvr8DET45WW(1.15):bd05/13/2011:svnLENOVO:pn4286CTO:pvrThinkPadX220:rvnLENOVO:rn4286CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4286CTO
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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