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[Eric Wilkison <ericw@xxxxxxxxxxxx>]

Still seeing this on a new install of Vivid (Gnome Edition) with kernel
3.19..0-25.  I am also running on a MacBook Pro and using external
monitors via thunderbolt ports.  A sleep/resume cycle after reboot
removes the symptom as well.

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https://bugs.launchpad.net/bugs/1321824

Title:
  gpe16 interrupt using > 90% cpu in gmux_index_wait_ready.isra

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  on a retina macbook pro (MacBookPro11,3), I recently* noticed >90% of
  cpu being used in kworker thread, similar to
  http://askubuntu.com/questions/444005/what-is-causing-ubuntu-on-
  macbook-pro-to-have-high-cpu-usage

  disabling the gpe16 interrupt restores cpu idleness, and the stack
  trace shows:

  # cat /proc/4/stack
  [<ffffffffa00f0077>] gmux_index_wait_ready.isra.7+0x47/0x70 [apple_gmux]
  [<ffffffffa00f0159>] gmux_index_write8+0x39/0x60 [apple_gmux]
  [<ffffffffa00f0e05>] gmux_notify_handler+0xd5/0x119 [apple_gmux]
  [<ffffffff813fba01>] acpi_ev_notify_dispatch+0x44/0x5c
  [<ffffffff813e86f8>] acpi_os_execute_deferred+0x14/0x20
  [<ffffffff810838a2>] process_one_work+0x182/0x450
  [<ffffffff81084641>] worker_thread+0x121/0x410
  [<ffffffff8108b312>] kthread+0xd2/0xf0
  [<ffffffff8172a2fc>] ret_from_fork+0x7c/0xb0
  [<ffffffffffffffff>] 0xffffffffffffffff

  
  *"recently" being yesterday, when I started plugging in an external monitor via mindisplayport/thunderbolt port, and also started using the 3.13.0-27-generic kernel image

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-27-generic 3.13.0-27.50
  ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
  Uname: Linux 3.13.0-27-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  jbarnett   2982 F.... pulseaudio
   /dev/snd/controlC0:  jbarnett   2982 F.... pulseaudio
   /dev/snd/controlC1:  jbarnett   2982 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Wed May 21 09:25:40 2014
  HibernationDevice: RESUME=UUID=948280a0-a059-468d-8484-f0d317f46e6d
  InstallationDate: Installed on 2014-02-24 (85 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140218)
  MachineType: Apple Inc. MacBookPro11,3
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-27-generic.efi.signed root=UUID=135fd833-3282-4f3b-8802-0a27ec2765b9 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-27-generic N/A
   linux-backports-modules-3.13.0-27-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/18/2013
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP112.88Z.0138.B02.1310181745
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-2BD1B31983FE1663
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,3
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-2BD1B31983FE1663
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP112.88Z.0138.B02.1310181745:bd10/18/2013:svnAppleInc.:pnMacBookPro11,3:pvr1.0:rvnAppleInc.:rnMac-2BD1B31983FE1663:rvrMacBookPro11,3:cvnAppleInc.:ct10:cvrMac-2BD1B31983FE1663:
  dmi.product.name: MacBookPro11,3
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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