You have been subscribed to a public bug:
The reported frequencies of an overclocked Core 2 Duo are incorrect.
Benchmarking and performance testing can confirm that the CPU is running
at the overclocked speeds, but the values reported through cpuinfo are
the standard stock speeds.
CPU has been overclocked from stock 3.00GHz to 3.60GHz. This can be
confirmed through dmidecode (output attached). The issue is that cpuinfo
(and related utilities) all report the stock CPU speeds instead. This is
only a visual/reporting issue. The CPU is still throttling correctly,
and the speed is correct as per the overclocking ratio.
i.e. (tested and confirmed in benchmarks & Bogomips)
Reported 2.00Ghz = (3.6/3.0 * 2.0) = 2.40GHz True Clock Speed
Reported 3.00Ghz = (3.6/3.0 * 3.0) = 3.60GHz True Clock Speed
There are a few reports of this in the Ubuntu forums, however no
resolution had been found. I have updated the BIOS on my motherboard
(ASUS P5Q) to the latest available, with no changes. All other BIOS
options are per standard - allowing CPU throttling/etc.
Bug #132403 makes reference to this similar issue, but this is not a
BIOS problem, only a reporting problem.
Compare:
cat /proc/cpuinfo
cpufreq-info
dmidecode --type processor
Only dmidecode is reporting the correct CPU speed as set in the BIOS.
Regards,
Robert.
---
Architecture: amd64
DistroRelease: Ubuntu 10.04
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
NonfreeKernelModules: nvidia
Package: cpufrequtils 006-2
PackageArchitecture: amd64
ProcEnviron:
LANG=en_NZ.utf8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-24.38-generic 2.6.32.15+drm33.5
Tags: lucid
Uname: Linux 2.6.32-24-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare vboxusers
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: apport-collected cpufreq cpufreq-info cpuinfo dmidecode
--
CPU Frequency Scaling Monitor reports incorrect CPU speeds when overclocked
https://bugs.launchpad.net/bugs/379873
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