CPU performance fluctuating under the cpufrequtils control

Bug #1350315 reported by User on 2014-07-30
This bug affects 2 people
Affects Status Importance Assigned to Milestone
cpufrequtils (Ubuntu)

Bug Description

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
 PATH=(custom, no user)
SourcePackage: cpufrequtils
UpgradeStatus: Upgraded to precise on 2013-12-13 (228 days ago)

User (kkr) wrote :
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in cpufrequtils (Ubuntu):
status: New → Confirmed
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