There are no warnings whatsoever in my syslog file about thermal
temperature.
I do see this message that seems to correspond with the slowdown:
intel_powerclamp: Start idle injection to reduce power
I have tried the 3.18.0-031800rc3-generic kernel. After running for a
few minutes, I did not see a problem. However, my PC soon froze. I
rebooted and it froze again. There may not have been enough time for the
idle injection to kick in, so I can't say if that kernel fixed the
problem or not.
I then installed the 3.16.0-031600-generic kernel. I did not experience
a noticeable slowdown, and I didn't observe any kidle_inject threads
using top. However, looking at my dmesg, I see the following messages:
[ 353.440226] intel_powerclamp: Start idle injection to reduce power
[ 357.442949] intel_powerclamp: Stop forced idle injection
[ 389.455697] intel_powerclamp: Start idle injection to reduce power
[ 393.455967] intel_powerclamp: Stop forced idle injection
[ 397.478979] intel_powerclamp: Start idle injection to reduce power
[ 401.479785] intel_powerclamp: Stop forced idle injection
[ 548.344665] chrome[3265]: segfault at 1f8 ip 00007f7e8ac2863f sp
00007fffd9265480 error 4 in i965_dri.so[7f7e8a8d5000+51c000]
[ 548.954533] chrome[3372]: segfault at 1f8 ip 00007fede229f63f sp
00007ffff1dc0e90 error 4 in i965_dri.so[7fede1f4c000+51c000]
[ 549.152357] chrome[3382]: segfault at 1f8 ip 00007fd000a4163f sp
00007fff3537ea60 error 4 in i965_dri.so[7fd0006ee000+51c000]
[ 768.798349] intel_powerclamp: Start idle injection to reduce power
[ 772.800659] intel_powerclamp: Stop forced idle injection
[ 776.827334] intel_powerclamp: Start idle injection to reduce power
[ 780.826651] intel_powerclamp: Stop forced idle injection
[ 796.853437] intel_powerclamp: Start idle injection to reduce power
[ 800.852951] intel_powerclamp: Stop forced idle injection
[ 804.972279] intel_powerclamp: Start idle injection to reduce power
[ 808.972072] intel_powerclamp: Stop forced idle injection
[ 812.992079] intel_powerclamp: Start idle injection to reduce power
[ 816.993884] intel_powerclamp: Stop forced idle injection
[ 821.115992] intel_powerclamp: Start idle injection to reduce power
[ 841.124582] intel_powerclamp: Stop forced idle injection
Because I don't believe the idle injection should be enabled at all, I tagged
this with the kernel-bug-exists-upstream tag.
One additional datapoint: I tested with the vmlinuz-3.13.0-39-generic
kernel, and I saw the same problem.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1389077
Title:
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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