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Repro: plug Logitech C270 (one I have) webcam in USB port (others with
builtin microphone are affected most likely)

Expected: device hooks up and works properly
Actual behavior: pulseaudio becomes unresponsive (totem freezes, volume controls work with huge delay, sound is not played at all), dmesg becomes flooded with messages like "7:3:4: cannot set freq 48000 to ep 0x86"

After unplugging webcam pulseaudio becomes responsive again.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pulseaudio 1:1.1-0ubuntu15.1
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic-pae 3.2.18
Uname: Linux 3.2.0-25-generic-pae i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC1D0c:   andy      17317 F...m pulseaudio
 /dev/snd/controlC2:  andy      17317 F.... pulseaudio
 /dev/snd/controlC0:  andy      17317 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfbff4000 irq 16'
   Mixer name	: 'Realtek ALC889'
   Components	: 'HDA:10ec0889,14627388,00100004'
   Controls      : 47
   Simple ctrls  : 23
Card1.Amixer.info:
 Card hw:1 'U0x46d0x825'/'USB Device 0x46d:0x825 at usb-0000:00:12.2-2, high speed'
   Mixer name	: 'USB Mixer'
   Components	: 'USB046d:0825'
   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 - 6144
   Mono: Capture 6144 [100%] [30.00dB] [off]
Card2.Amixer.info:
 Card hw:2 'NVidia'/'HDA NVidia at 0xfeafc000 irq 19'
   Mixer name	: 'Nvidia GPU 16 HDMI/DP'
   Components	: 'HDA:10de0016,10de0101,00100100'
   Controls      : 25
   Simple ctrls  : 5
Date: Fri Jun  1 19:48:01 2012
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to precise on 2012-04-26 (35 days ago)
dmi.bios.date: 05/12/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V8.6
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 770T-C45 (MS-7388)
dmi.board.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
dmi.board.version: 3.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
dmi.chassis.version: 3.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV8.6:bd05/12/2010:svnMICRO-STARINTERNATIONALCO.,LTD:pnMS-7388:pvr3.0:rvnMICRO-STARINTERNATIONALCO.,LTD:rn770T-C45(MS-7388):rvr3.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr3.0:
dmi.product.name: MS-7388
dmi.product.version: 3.0
dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO.,LTD

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug bios-outdated-8.7 i386 needs-upstream-testing precise quantal regression-potential
-- 
pulseaudio stops responding after plugging Logitech webcam in
https://bugs.launchpad.net/bugs/1007542
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