Public bug reported:

Sometime usually during seeking through a movie in Totem or switching
videos in youtube play lists audio goes strange and whistley. This is
worked around by killing pulseaduio with pulseaudio -k

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pulseaudio 1:1.1-0ubuntu15
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  graingert   4346 F.... pulseaudio
 /dev/snd/pcmC0D0p:   graingert   4346 F...m pulseaudio
 /dev/snd/controlC1:  graingert   4346 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xfba00000 irq 54'
   Mixer name   : 'Intel CougarPoint HDMI'
   Components   : 'HDA:10ec0892,14627681,00100302 
HDA:80862805,80862805,00100000'
   Controls      : 50
   Simple ctrls  : 22
Card1.Amixer.info:
 Card hw:1 'U0x46d0x81d'/'USB Device 0x46d:0x81d at usb-0000:06:00.0-2, high 
speed'
   Mixer name   : 'USB Mixer'
   Components   : 'USB046d:081d'
   Controls      : 2
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'Mic',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
   Capture channels: Mono
   Limits: Capture 0 - 16
   Mono: Capture 13 [81%] [25.50dB] [on]
Date: Sat Apr 28 14:31:51 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20120201.1)
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/08/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V23.2
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z68A-GD55 (MS-7681)
dmi.board.vendor: MSI
dmi.board.version: 4.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 4.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV23.2:bd09/08/2011:svnMSI:pnMS-7681:pvr4.0:rvnMSI:rnZ68A-GD55(MS-7681):rvr4.0:cvnMSI:ct3:cvr4.0:
dmi.product.name: MS-7681
dmi.product.version: 4.0
dmi.sys.vendor: MSI

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/990498

Title:
  pulseaudio sometime starts whistling, have to restart with pulseaudio
  -k

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