CPU Frequency Scaling Monitor reports incorrect CPU speeds when overclocked
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Low
|
Unassigned |
Bug Description
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)
NonfreeKernelMo
Package: cpufrequtils 006-2
PackageArchitec
ProcEnviron:
LANG=en_NZ.utf8
SHELL=/bin/bash
ProcVersionSign
Tags: lucid
Uname: Linux 2.6.32-24-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare vboxusers
Changed in cpufrequtils (Ubuntu): | |
status: | Incomplete → Confirmed |
Changed in cpufrequtils (Ubuntu): | |
status: | Confirmed → Opinion |
no longer affects: | linux (Ubuntu) |
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
affects: | linux (openSUSE) → linux (Ubuntu) |
Changed in linux (Ubuntu): | |
status: | New → Incomplete |
tags: | removed: apport-collected cpufreq cpufreq-info cpuinfo dmidecode |
tags: | added: apport-collected cpufreq cpufreq-info cpuinfo dmidecode |
Apologies - neglected to report on Ubuntu/kernel version information:
Description: Ubuntu 9.04
Release: 9.04
Linux thundercat 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:58:03 UTC 2009 x86_64 GNU/Linux
All latest updates/patches as available on May 24, 2009