Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug utopic
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https://bugs.launchpad.net/bugs/1403653
Title:
Kworker takes 100% CPU when booting with efi
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