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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1301003

Title:
  kworker runs with 40-60% CPU because of modules e1000 and/or e1000e

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Once in a blue moon, lets say once every two months, kworker runs with
  40-60% CPU because of kernel modules e1000 and/or e1000e.  Reboot the
  machine does not help.  I rebooted twice to no avail

  I then ran:

    sudo modprobe -r e1000
    sudo modprobe -r e1000e

  and the problem was gone.

  When I run the following afterwards:

    sudo modprobe e1000
    sudo modprobe e1000e

  ... the kworker ran for less than 1s and exited.

  This particular problem was already reported in bug #887739.

    https://bugs.launchpad.net/ubuntu/+source/linux/+bug/887793

  but was not the problem of the person that reported it, thus this new
  bug report.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-60-generic 3.2.0-60.91
  ProcVersionSignature: Ubuntu 3.2.0-60.91-generic 3.2.55
  Uname: Linux 3.2.0-60-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
     Subdevices: 2/2
     Subdevice #0: subdevice #0
     Subdevice #1: subdevice #1
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfe220000 irq 49'
     Mixer name	: 'Analog Devices AD1984'
     Components	: 'HDA:11d41984,17aa20bb,00100400'
     Controls      : 32
     Simple ctrls  : 20
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7KHT22WW-1.06'
     Mixer name	: 'ThinkPad EC 7KHT22WW-1.06'
     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 Apr  1 16:31:37 2014
  HibernationDevice: RESUME=UUID=3b244221-fe9e-429c-8bd3-c541dbf92fcc
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: LENOVO 646066U
  MarkForUpload: True
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-60-generic root=/dev/mapper/hostname-root ro quiet splash nmi_watchdog=0
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-60-generic N/A
   linux-backports-modules-3.2.0-60-generic  N/A
   linux-firmware                            1.79.11
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/27/2007
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7LET44WW (1.14 )
  dmi.board.name: 646066U
  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:bvr7LET44WW(1.14):bd06/27/2007:svnLENOVO:pn646066U:pvrThinkPadT61:rvnLENOVO:rn646066U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 646066U
  dmi.product.version: ThinkPad T61
  dmi.sys.vendor: LENOVO

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