How to get SpeedStep working on Coppermine-piix4-smi based ThinkPads

2004-12-04T03:46:45Z

65.96.190.213: /* Foreword */

==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, T23 and possibly A2x models.
: These CPUs support (as i could notice) at least 3 different running speed, but it seems that the SpeedStep driver (and maybe the SpeedStep Data Sheet) only allows 2 diffrent running modes.

: 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==
: Easy =) just disable the speedstep-lib checks
[xaiki@gonzo]:~% sudo modprobe speedstep-lib relaxed_check=1
[xaiki@gonzo]:~% sudo modprobe speedstep-smi
: Hurrah !!
==How to use it==
===Using the sys interface===
: speeds are in Khz.
: your max speed is at: /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
gonzo:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
700000
: your min speed is at: /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
gonzo:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
500000
: echo to /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed to change the speed
gonzo:/home/xaiki# echo 700000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
gonzo:~# cat /proc/cpuinfo | grep "cpu MHz"
cpu MHz : 697.252
gonzo:~# echo 900000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
gonzo:~# cat /proc/cpuinfo | grep "cpu MHz"
cpu MHz : 976.152
: don't trust no-one, my cpu is a 200-450-500-750 Speedstep capable... i'd like it to run at 1Ghz ...

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

[[Category:T20]] [[Category:T21]] [[Category:T22]] [[Category:T23]] [[Category:X20]] [[Category:X21]] [[Category:X22]] [[Category:X23]] [[Category:X24]]

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How to get SpeedStep working on Coppermine-piix4-smi based ThinkPads