My GPU seems fine, well under the high threshold. I can see what the
logic is of throttling the CPU because the GPU is overheating--if the
CPU is throttled then less data is being fed to the GPU so the GPU is
indirectly slowed. But you're right, reducing the CPU by half is
overkill. And that seems to be my problem as well. Without the
powerclamp, my temperature goes slightly over the high threshold, maybe
87 deg with a threshold of 85 degrees, but the idle goes at 50% for
quite some time.
I don't want to remove the powerclamp driver, since I don't want my CPU
to overheat. But 50% CPU reduction to control temperature that is
slightly exceeding the max makes my machine unusable.
Looking at the documentation for the powerclamp technology and the proc
values, it looks like any level under 50% can be selected. I don't think
it is powerclamp itself choosing the value, so there must be some
thermal protection module that is choosing all or nothing. It really
should gradually start injecting until the temperature is acceptable,
IMO.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1389077
Title:
[HP ProBook 4530s] Intel Powerclamp is Slowing CPU
Status in “linux” package in Ubuntu:
Confirmed
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/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
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