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[Mathias-bavay <887793@xxxxxxxxxxxxxxxxxx>]

The problem also appears with kernel 3.8.0-33-generic on my laptop (see
my other comments above). I am now 100% positive this is linked to the
wifi (ipw2200 card). I loose all network connectivity, thunderbird gets
crazy (high cpu usage) and I see one or two kworker processes. Turning
wifi off does not solve the problem (even waiting several minutes), but
when turning it back, it solves the problem right away (the kworkers
disapear and thunderbird starts behaving again).

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https://bugs.launchpad.net/bugs/887793

Title:
  Kworker constantly taking about 100% CPU

Status in The Linux Kernel:
  Confirmed
Status in “linux” package in Ubuntu:
  Confirmed
Status in “linux” package in Arch Linux:
  New
Status in “linux” package in Suse:
  New

Bug description:
  I've this issue since the latest Ubuntu 11.10 version, all updates
  applied till today, and it's still there. Ubuntu 11.04 did not have
  this issue.

  If I run top there is a Kworker constantly taking much CPU, I don't
  know how to research where this comes from.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-12-generic 3.0.0-12.20
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  kp         1473 F.... pulseaudio
  CRDA: Error: [Errno 2] Bestand of map bestaat niet
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xe4404000 irq 46'
     Mixer name	: 'Analog Devices AD1981'
     Components	: 'HDA:11d41981,103c30c0,00100200 HDA:11c11040,103c1378,00100200'
     Controls      : 11
     Simple ctrls  : 9
  Date: Tue Nov  8 22:29:10 2011
  HibernationDevice: RESUME=UUID=ad8d4a18-9fe4-4246-ba44-85cf6b4dace5
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  MachineType: Hewlett-Packard HP Compaq 6710b (GB891ET#ABH)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=686d2155-83a9-4743-a2a4-8e9570ee3da6 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-12-generic N/A
   linux-backports-modules-3.0.0-12-generic  N/A
   linux-firmware                            1.60
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/15/2009
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68DDU Ver. F.15
  dmi.board.name: 30C0
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 71.2E
  dmi.chassis.asset.tag: CNU72913PH
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68DDUVer.F.15:bd01/15/2009:svnHewlett-Packard:pnHPCompaq6710b(GB891ET#ABH):pvrF.15:rvnHewlett-Packard:rn30C0:rvrKBCVersion71.2E:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Compaq 6710b (GB891ET#ABH)
  dmi.product.version: F.15
  dmi.sys.vendor: Hewlett-Packard

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