Arch Linux

sydney

Member

Registered: 2005-11-25

Posts: 63

Change FSB_base_frequency from 133MHz to 100MHz

Hi. Is it possible to change FSB_base_frequency Table?
My Pentium-M 1,83GHz CPU is running now @800MHz  ( 6x133MHz)
I want change the FrontSideBus from 133MHz to 100MHz (6x100MHz)
Why? Lees Power Consuming, Lower the Heat, Longer Battery Time. NO FAN.
In Bios i cant change anything its a Notebook ( Acer 1693 Wlmi )

Yesterday i saw this:
cat /sys/devices/system/cpu/cpu0/cpufreq/FSB_base_frequency
Base FSB frequency computed from operating points table:
133357 kHz (1867000 / 14)
133333 kHz (1600000 / 12)
133300 kHz (1333000 / 10)
133375 kHz (1067000 / 8)
133333 kHz (800000 / 6)

Is it possible to change this value (anyway)?

cpufreq-info
cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
  driver: centrino
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 1.87 GHz
  available frequency steps: 1.87 GHz, 1.60 GHz, 1.33 GHz, 1.07 GHz, 800 MHz
  available cpufreq governors: userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 800 MHz.
  The governor "powersave" may decide which speed to use within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).

kano

Member

From: Michigan

Registered: 2007-05-04

Posts: 185

Website

Re: Change FSB_base_frequency from 133MHz to 100MHz

I'm not 100% positive, but I'm going to say there's a 99% chance that you can't change it. FSB needs to be set in a BIOS, and if you can't, you're out of luck.

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\\ archlinux on a XPS M1530 //

lloeki

Member

From: France

Registered: 2007-02-20

Posts: 456

Website

Re: Change FSB_base_frequency from 133MHz to 100MHz

heat: force throttling (!= freq scaling) via /proc/acpi/processor/cpu*/throttling
power: freq scaling (which you already use)

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