strange frequency scaling

n0stradamus · 2011-03-10 14:38:13

Hello everyone!

I use an Intel Celeron 430 on a Zotac G31 Value and have recently installed cpufrequtils.
After modrpobing "p4-clockmod" and activating the "ondemand"-governor, no frequency scaling takes place at all.
But scaling apparently is possible, because the "powersave"-governor scales down to 225Mhz (which is the absolute minimum).

The frequency scaling isn't absolutely neccessary for me, but would be nice to have.
Any hints at where I should look?

Gusar · 2011-03-10 14:51:10

p4-clockmod doesn't provide scaling, it provides, as the module name says, modulation. Different thing. It's purpose is thermal management, not power saving.

What you should be using is acpi_cpufreq

Last edited by Gusar (2011-03-10 14:52:16)

n0stradamus · 2011-03-10 15:07:23

Gusar wrote:

p4-clockmod doesn't provide scaling, it provides, as the module name says, modulation. Different thing. It's purpose is thermal management, not power saving.
What you should be using is acpi_cpufreq

Already tried before. That gives me the following:

FATAL: Error inserting acpi_cpufreq (/lib/modules/2.6.37-ARCH/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko.gz): No such device

So it seems to be a hardware problem after all.

Gusar · 2011-03-10 16:27:57

Not necessarily hardware problem, but BIOS/ACPI problem. Is there a bios update available? If not, or if it doesn't work, you're probably out of luck. Google only finds a few people with the same problem, but no solution. Well, there's one idea: Have you looked in the bios? Maybe speedstep (or something like that) needs to be turned on.
Or, totally crazy, you go play with ACPI tables: http://pat.erley.org/Other/P4EISTSSDT

Last edited by Gusar (2011-03-10 16:38:59)

n0stradamus · 2011-03-10 17:58:18

I'm gonna have a look at the BIOS updates and see wether it's worth the danger (I've made bad experiences with BIOS-Updates before).
Messing with ACPI tables shall be postponed

Thanks for your help

Arch Linux

#1 2011-03-10 14:38:13

strange frequency scaling

#2 2011-03-10 14:51:10

Re: strange frequency scaling

#3 2011-03-10 15:07:23

Re: strange frequency scaling

#4 2011-03-10 16:27:57

Re: strange frequency scaling

#5 2011-03-10 17:58:18

Re: strange frequency scaling

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