Public bug reported:
Hello,
I've run a very CPU intensive task on my Laptop, which used both kernel
about 100%. If the system is fresh restarted from cold boot. I can run
the application about 15 minutes and both cores of the CPU running with
her maximum clock rate. After that time, the cpufreq throttling the
clock-rate from maximum to minimum possible value (2533 to 800 in this
case). This is obviously wrong, but it's even worse that it stuck a 800
MHz all time from now on. I have stop my application and I’ve tried also
to change the governor (also in the first place) and the minimum clock-
speed over the /sys/ interface. But it seems that nothing can change the
clock-speed to get higher then 800 MHz. Only a cold reboot will recover
the full clock-speed of the CPU, but as I write, only for round about 15
minutes from them.
Thanks for you help and please let me know when more information or actions
from my side are required.
I'm willing to help to get to the bottom of it, since it effects the
performance of my laptop in such a bad way, that productive working is now
longer possible.
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-11-generic 2.6.38-11.48
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: arxs 1739 F.... pulseaudio
CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf6fdc000 irq 47'
Mixer name : 'IDT 92HD71B7X'
Components : 'HDA:111d76b2,10280233,00100302
HDA:14f12c06,14f1000f,00100000'
Controls : 15
Simple ctrls : 10
Date: Fri Aug 26 07:51:14 2011
HibernationDevice: RESUME=UUID=04f5a147-5f28-4bb0-b6cd-b6071f15ceb6
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110302)
MachineType: Dell Inc. Latitude E6400
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcEnviron:
LANGUAGE=de_DE:en
LANG=de_DE.UTF-8
SHELL=/bin/zsh
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-11-generic
root=UUID=a2fa100c-15ea-4153-9886-38a2da98c922 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-2.6.38-11-generic N/A
linux-backports-modules-2.6.38-11-generic N/A
linux-firmware 1.52.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/16/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A28
dmi.board.name: 0T279F
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA28:bd02/16/2011:svnDellInc.:pnLatitudeE6400:pvr:rvnDellInc.:rn0T279F:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude E6400
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug cpufreq natty running-unity
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https://bugs.launchpad.net/bugs/834420
Title:
cpufreq throttling down clock while cpu on full load and never recover
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