Public bug reported:
After an approximately 6 hours of oreration the CPU performance gets
fluctuations leading to overall system performance degradation. The System
Monitor's CPU usage history displays a saw-like CPU load graph, see the
attachment.
The cpufrequtils service restart recovers the performance.
The system thermal status is fine.
HW: Intel Core i3 processor + Intel H55 chipset.
Switching governors e.g. "ondemand" to "performance" and back may provoke the
bug.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: cpufrequtils 007-2
ProcVersionSignature: Ubuntu 3.2.0-67.101-generic 3.2.60
Uname: Linux 3.2.0-67-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Wed Jul 30 13:58:10 2014
InstallationMedia: Kubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64
(20130214)
MarkForUpload: True
ProcEnviron:
LANGUAGE=en_US
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: cpufrequtils
UpgradeStatus: Upgraded to precise on 2013-12-13 (228 days ago)
** Affects: cpufrequtils (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise
** Attachment added: "CPU load example"
https://bugs.launchpad.net/bugs/1350315/+attachment/4165755/+files/cpufrequtils.jpg
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https://bugs.launchpad.net/bugs/1350315
Title:
CPU performance fluctuating under the cpufrequtils control
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