From owner-freebsd-acpi@FreeBSD.ORG  Tue May  1 16:14:56 2012
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Date: Wed, 2 May 2012 02:14:31 +1000 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Nikolay Tychina <niktychina@gmail.com>
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Cc: freebsd-acpi@freebsd.org
Subject: Re: Brightness keys and booting the kernel
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On Tue, 1 May 2012 14:55:59 +0400, Nikolay Tychina wrote:

 > Considering the fact that brightness keys work until kernel is loaded,
 > is it possible to make them work
 > after the kernel is booted in some simple way?
 > I remember my previous laptop was able to control brightness without
 > any acpi_* modules and disregarding
 > OS running.

What make and model laptop?  What OS?  (this one, and the previous?)

% head -24 /var/run/dmesg.boot

should provide a clue or two.

cheers, Ian