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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

This is possibly a duplicate of upstream bug:
https://bugzilla.kernel.org/show_bug.cgi?id=85881

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https://bugs.launchpad.net/bugs/1403653

Title:
  Kworker takes 100% CPU when booting with efi

Status in The Linux Kernel:
  Unknown
Status in linux package in Ubuntu:
  Triaged

Bug description:
  When running on a Macbook Pro Retina that has been booted with EFI, a
  kworker process constantly takes 100% CPU. If you boot in legacy mode
  this does not happen.

  When grepping for large values in  /sys/firmware/acpi/interrupts, this
  one stands out:

  /sys/firmware/acpi/interrupts/gpe66: 2510732   enabled

  Trying to disable it with

  echo disable > /sys/firmware/acpi/interrupts/gpe66

  makes the CPU load go away.

  This will also prevent installation of Ubuntu, because if you try to
  install when kworker is running causes ubiquity to hang while trying
  to format the disk.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-28-generic 3.16.0-28.38
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jpakkane   2346 F.... pulseaudio
   /dev/snd/controlC0:  jpakkane   2346 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Dec 17 23:36:32 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-12-17 (0 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Apple Inc. MacBookPro11,1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic.efi.signed root=UUID=7196f220-ff77-4982-bfc1-03506a8013f7 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-28-generic N/A
   linux-backports-modules-3.16.0-28-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/29/2014
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP111.88Z.0138.B11.1408291433
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-189A3D4F975D5FFC
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-189A3D4F975D5FFC
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP111.88Z.0138.B11.1408291433:bd08/29/2014:svnAppleInc.:pnMacBookPro11,1:pvr1.0:rvnAppleInc.:rnMac-189A3D4F975D5FFC:rvrMacBookPro11,1:cvnAppleInc.:ct10:cvrMac-189A3D4F975D5FFC:
  dmi.product.name: MacBookPro11,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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