[HP ProBook 4530s / Lenovo G580] Intel Powerclamp is Slowing CPU
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Medium
|
Unassigned |
Bug Description
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/
root@bkat-
intel_powerclamp
root@bkat-
-1
root@bkat-
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-
ProcVersionSign
Uname: Linux 3.16.0-24-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CurrentDesktop: KDE
Date: Mon Nov 3 23:16:04 2014
HibernationDevice: RESUME=
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=
RelatedPackageV
linux-
linux-
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.
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-
dmi.product.name: HP ProBook 4530s
dmi.product.
dmi.sys.vendor: Hewlett-Packard
tags: | added: kernel-bug-exists-upstream |
tags: |
added: bios-outdated-f.41 removed: kernel-bug-exists-upstream |
summary: |
- Intel Powerclamp is Slowing CPU + [HP ProBook 4530s] Intel Powerclamp is Slowing CPU |
summary: |
- [HP ProBook 4530s] Intel Powerclamp is Slowing CPU + [HP ProBook 4530s / Lenovo G580] Intel Powerclamp is Slowing CPU |
tags: | added: cscc |
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