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[Bug 379873] Re: CPU Frequency Scaling Monitor reports incorrect CPU speeds when overclocked

 

See: http://www.gskill.us/forum/showthread.php?t=13415

After following the instructions from the RAM support tech:

- Change CPU bus to 233 from 200
- Change CPU multiplier to restore stock clock (actually a slight overclock)
- Change DRAM voltage from 1.5 to 1.6
- Increase CPU-NB voltage by 0.1V to 1.225v
- Manually input RAM timings

The BIOS reports everything took, but Ubuntu 14.04 is reporting a CPU
processor speed of 2.8 Ghz and RAM speed of 1600 Mhz

See any of the Phoronix benchmarks posted there for evidence.

As far as I can tell, the CPU is running at the higher clock, but Ubuntu
is mis-reporting.

** Changed in: linux (Ubuntu)
       Status: Expired => Confirmed

** Tags added: apport-collected cpufreq cpufreq-info cpuinfo dmidecode

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https://bugs.launchpad.net/bugs/379873

Title:
  CPU Frequency Scaling Monitor reports incorrect CPU speeds when
  overclocked

Status in linux package in Ubuntu:
  Confirmed

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)
  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

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