[PlanetCCRMA] Laptop Power Management - cpufreq

Steven Yi kunstmusik@hotmail.com
Wed Apr 28 12:16:02 2004

Hi Fernando,

I use APM as ACPI on linux does not work on my laptop (IBM Thinkpad T23).  
I'm actually having a hard time finding the source for these speedstep 
modules on the web.  It seems to have been added to Fedora Core 1 as it's in 
the release notes:


under Kernel Modules (near bottom).  These modules do come with the stock 
Fedora kernel.

Thanks for your reply!

>From: Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU>
>To: Steven Yi <kunstmusik@hotmail.com>
>CC: planetccrma@ccrma.Stanford.EDU
>Subject: Re: [PlanetCCRMA] Laptop Power Management - cpufreq
>Date: 28 Apr 2004 02:47:34 -0700
> > I'm running FC1 and kernel 2.4.24-1.ll.rhfc1.ccrma on a Thinkpad T23 
> > (Pentium III Mobile).  I just recently noticed that cpufreq does not 
> > and that some kernel modules don't exist with this ccrma kernel,
> > specifically speedstep-centrino, speedstep-lib, and speedstep-ich.  The
> > reason I even got so far as to figure this out is that I realized lately
> > that when doing "cat /proc/cpuinfo" that the cpu speed wasn't changing 
> > AC power or not.
>Hmmm, maybe that is provided by APM? I have to investigate, don't really
>know. For historical reasons the Planet CCRMA kernel starts with acpi
>enabled (Fedora's kernel starts with it disabled) so you may want to
>turn that off if you need APM instead. Add "acpi=off" in the kernel boot
> > Is there something I'm missing and cpu frequency is controlled by some 
> > means?
>You'll find the acpi stuff in:
>   /proc/acpi/*
>-- Fernando

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