Public bug reported:
I upgraded from KUbuntu 14.04 to 14.10. Immediately, while playing
minecraft with my daughter, I noticed the game was running very slowly.
Even after closing the game, my web browsing slowed to a crawl.
Looking at the processes in top, I noticed there were 4 tasks called
kidle_inject running at 50% CPU each. After spending a long time
figuring out what caused this, I found out this is caused by the Intel
Powerclamp driver. I never did anything to enable this, and haven't
observed this slowdown before the upgrade.
I found the powerclamp driver in the /sys/class/thermal/cooling_device5
directory:
root@bkat-HP-ProBook-4530s:/sys/class/thermal/cooling_device5# cat type
intel_powerclamp
root@bkat-HP-ProBook-4530s:/sys/class/thermal/cooling_device5# cat cur_state
-1
root@bkat-HP-ProBook-4530s:/sys/class/thermal/cooling_device5# cat max_state
50
I tried to echo 0 to cur_state, but it still reported -1 when I catted
the value.
There seems to be no obvious way to disable this, and this should not
have been enabled in the first place.
ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: linux-image-3.16.0-24-generic 3.16.0-24.32
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: bkat 2780 F.... pulseaudio
CurrentDesktop: KDE
Date: Mon Nov 3 23:16:04 2014
HibernationDevice: RESUME=UUID=35e1d874-a3bd-4227-acab-16f3e929d993
InstallationDate: Installed on 2012-04-22 (925 days ago)
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MachineType: Hewlett-Packard HP ProBook 4530s
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic
root=UUID=743f1686-bfe7-4e32-911d-5371633ccec8 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.16.0-24-generic N/A
linux-backports-modules-3.16.0-24-generic N/A
linux-firmware 1.138
SourcePackage: linux
UpgradeStatus: Upgraded to utopic on 2014-11-03 (0 days ago)
dmi.bios.date: 05/13/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68SRR Ver. F.09
dmi.board.name: 167C
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 22.1A
dmi.chassis.asset.tag: CNU1284V1X
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvr68SRRVer.F.09:bd05/13/2011:svnHewlett-Packard:pnHPProBook4530s:pvrA0001D02:rvnHewlett-Packard:rn167C:rvrKBCVersion22.1A:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP ProBook 4530s
dmi.product.version: A0001D02
dmi.sys.vendor: Hewlett-Packard
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug utopic
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https://bugs.launchpad.net/bugs/1389077
Title:
Intel Powerclamp is Slowing CPU
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