Difference between revisions of "How to get SpeedStep working on Coppermine-piix4-smi based ThinkPads"

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==How to use it==
 
==How to use it==
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This may be better suited elsewhere as it is not smi specific.
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[[How to make use of Dynamic Frequency Scaling]]
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: there are many deamons on the wild that will handle the work, here what Debian says:
 
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cpudyn - CPU dynamic frequency control for processors with scaling
 
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cpufreqd - A speedstep applet clone
 
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cpufrequtils - utilities to deal with the cpufreq linux kernel feature
 
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gnome-cpufreq-applet - CPU Frequency Scaling Monitor applet for GNOME
 
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powernowd - control cpu speed and voltage using 2.6 kernel interface
 
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===Using the sys interface===
 
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: speeds are in Khz.
 
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: your max speed is at: /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
 
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gonzo:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
 
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700000
 
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: your min speed is at: /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
 
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gonzo:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
 
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500000
 
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: echo to /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed to change the speed
 
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gonzo:/home/xaiki# echo 700000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
 
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gonzo:~# cat /proc/cpuinfo  | grep "cpu MHz"
 
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cpu MHz        : 697.252
 
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gonzo:~# echo 900000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
 
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gonzo:~# cat /proc/cpuinfo  | grep "cpu MHz"
 
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cpu MHz        : 976.152
 
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: don't trust no-one, my cpu is a 500-700 Speedstep capable... i'd like it to run at 1Ghz ...
 
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===cpudyn===
 
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: please test and report.
 
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===cpufreqd===
 
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: works out of the box
 
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===cpufrequtils===
 
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: This package mainly has 2 programs:
 
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/usr/bin/cpufreq-info
 
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/usr/bin/cpufreq-set
 
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: cpufreq-info gives general device information:
 
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xaiki@gonzo:~$ cpufreq-info
 
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cpufrequtils 0.2: cpufreq-info (C) Dominik Brodowski 2004
 
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Report errors and bugs to linux@brodo.de, please.
 
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analyzing CPU 0:
 
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  driver: speedstep-smi
 
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  CPUs which need to switch frequency at the same time: 0
 
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  hardware limits: 500 MHz - 700 MHz
 
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  available frequency steps: 700 MHz, 500 MHz
 
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  available cpufreq governors: userspace, performance
 
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  current policy: frequency should be within 500 MHz and 700 MHz.
 
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                  The governor "userspace" may decide which speed to use
 
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                  within this range.
 
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  current CPU frequency is 700 MHz.
 
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: and cpufreq-set allows setting
 
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... Never got it working ...
 
  
 
==What's not working==
 
==What's not working==

Revision as of 13:43, 11 April 2005

Foreword

APPLYING THIS HOWTO MAY MAKE YOU DUMB, CRASH YOUR CPU, YOUR MOTHERBOARD, MAKE YOUR GIRLFRIEND LEAVE YOU, OR MAYBE WORSE, USE IT AT YOUR OWN RISKS, I'M NOTHING OF A KERNEL HACKER, NEITHER A SMART GUY, THIS IS HOW I TRYED TO GET IT WORK, AND TILL NOW IT IS WORKING, MY PROPOSITION ARE ALMOST GUARANTED TO BE DUMB.
This HowTo is intended for people having trouble getting SpeedStep working via CpuFreq on their Coppermine CPU with a piix4 mainboard.
Thinkpads known to have this configuration are the X20, X21, X22, X23, X24, T20, T21, T22 and possibly A2x models.
The issue is that these CPU do not repport correctly that they are SpeedStep capables
This Document is under the GNU/GPL v2+ Licence.

My case

This is what i get:
I have a x21 IBM ThinkPad, and when trying the SpeedStep implementation of 2.6 kernels i got:
[xaiki@gonzo]:~% sudo modprobe speedstep-smi
FATAL: Error inserting speedstep_smi    (/lib/modules/2.6.10-rc1-mm4-xa1/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-smi.ko): No such device
Rebooting with cpufreq.debug=7 ( 1 is for core, 2 is for ??, and 4 is for drivers, 7 = 1 + 2 + 4 ) gave:
[xaiki@gonzo]:~% sudo modprobe speedstep-smi
FATAL: Error inserting speedstep_smi   (/lib/modules/2.6.10-rc1-mm4-xa1/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-smi.ko): No such device
[xaiki@gonzo]:~% sudo tail /var/log/syslog
[...]
Nov 11 19:54:20 localhost kernel: speedstep-lib: x86: 6, model: 8
Nov 11 19:54:20 localhost kernel: speedstep-lib: Coppermine: MSR_IA32_EBL_CR_POWERON is 0x44080020, 0x0
Nov 11 19:54:20 localhost kernel: speedstep-lib: Coppermine: MSR_IA32_PLATFORM ID is 0x0, 0x540000
Nov 11 19:54:20 localhost kernel: speedstep-smi: No supported Intel CPU detected.

How to get it work

Note: to get this working on recent kernels you'll need:
CONFIG_X86_SPEEDSTEP_RELAXED_CHECK = y
Easy =) just disable the speedstep-lib checks
[xaiki@gonzo]:~% sudo modprobe speedstep-lib relaxed_check=1
[xaiki@gonzo]:~% sudo modprobe speedstep-smi
Hurrah !!
In Debian ( and probably with others, please confirm ), you can automate the module parmeters by creating a /etc/modprobe.d/speedstep-lib file with:
options speedstep-lib relaxed_check=1
And then, you may add /etc/modules these 2 lines:
speedstep-lib
speedstep-smi

How to use it

How to make use of Dynamic Frequency Scaling

What's not working

Obviously, what's not working is the other steps, and the current-speed reconignition.
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