From mboxrd@z Thu Jan  1 00:00:00 1970
From: "W. Brown" <wbrownab@comcast.net>
Subject: Re: speedstep won't load even with acpi tables
Date: Tue, 05 Oct 2004 19:12:59 -0400
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	<20041005215350.GA1299@dominikbrodowski.de>
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To: cpufreq@www.linux.org.uk

Ah, thanks Dominik, that was an easy fix.

I incorrectly assumed that that was a helper for the cpu specific 
module. I was going by the Gentoo Power management guide 
<http://www.gentoo.org/doc/en/power-management-guide.xml> which says to 
configure:

<M> ACPI Processor P-States driver

and

<*> CPUFreq driver for your processor

It goes on to say...

"Compile your kernel, make sure the right modules get loaded at startup 
and boot into your new ACPI-enabled kernel." They didn't explain what 
the "right modules" are though. My bad.

Will




Dominik Brodowski wrote:

>Hi,
>
>You already got speedstep up and running using the ACPI cpufreq driver:
>
>  
>
>>>acpi 4684 0 - Live 0xe09cc000
>>>      
>>>
>
>  
>
>>>CONFIG_X86_ACPI_CPUFREQ=m
>>>      
>>>
>
>  
>
>>>#cpu
>>>non-fatal
>>>acpi
>>>      
>>>
>
>you load it _before_ speedstep-centrino, even. disabling it should allow you
>to load the (faster) speedstep-centrino module...
>
>  
>
>>>Oct  5 12:30:29 shake cpufreq: CPU0 - ACPI performance management activated.
>>>Oct  5 12:30:29 shake cpufreq: *P0: 1700 MHz, 21000 mW, 100 uS
>>>Oct  5 12:30:29 shake cpufreq:  P1: 1400 MHz, 17500 mW, 100 uS
>>>Oct  5 12:30:29 shake cpufreq:  P2: 1200 MHz, 15000 mW, 100 uS
>>>Oct  5 12:30:29 shake cpufreq:  P3: 1000 MHz, 12500 mW, 100 uS
>>>Oct  5 12:30:29 shake cpufreq:  P4: 800 MHz, 10000 mW, 100 uS
>>>Oct  5 12:30:29 shake cpufreq:  P5: 600 MHz, 7500 mW, 100 uS
>>>      
>>>
>
>... with which you should get 10uS latencies instead of 100 uS.
>
>	Dominik
>
>  
>