From owner-freebsd-stable@FreeBSD.ORG  Wed Nov 30 21:57:47 2005
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Date: Wed, 30 Nov 2005 13:57:42 -0800
From: Nate Lawson <nate@root.org>
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To: Marco Calviani <marco.calviani@gmail.com>
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Cc: freebsd-acpi@freebsd.org, freebsd-stable@freebsd.org,
	freebsd-questions@freebsd.org
Subject: Re: cpufreq and changing driver
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Marco Calviani wrote:
> Hi Bruno,
> 
> 2005/11/30, Bruno Ducrot <ducrot@poupinou.org>:
> 
> 
>>Did you load the cpufreq driver at boot time which include the est
>>driver as said before?  It will replace the acpi_perf if appropriate.
>>
>>--
>>Bruno Ducrot
> 
> 
> Yes cpufreq is loaded at boot time in /boot/loader.conf .However i
> don't know how to tell him that i want to load est instead of
> acpi_perf.

est is preferred if supported.  But probably est doesn't have a table 
for his processor so acpi_perf is used.  There's nothing wrong with 
using acpi_perf -- it just gives a BIOS interface to est anyway.

You can test this with:
hint.acpi_perf.0.disabled="1"

This will cause acpi_perf to let est attach.  But I suspect est won't.

-- 
Nate