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Date: Wed, 5 Feb 2014 12:42:48 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Eitan Adler <lists@eitanadler.com>
Subject: Re: Story of a laptop user
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Cc: Adrian Chadd <adrian@freebsd.org>, desktop@freebsd.org,
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On Wed, 5 Feb 2014, Eitan Adler wrote:

> On Wed, Feb 5, 2014 at 1:25 PM, Adrian Chadd <adrian@freebsd.org> wrote:
>> hi,
>>
>> Try (if I'm reading your dump correctly):
>>
>> _SB.PCI0.PEG0.VGA.LCD._BCM
>> _SB.PCI0.PEG1.VGA.LCD._BCM
>> _SB.PCI0.GFX0.DD02._BCM
>>
>> .. god I wish we had a way to actually just dump the tree in a useful
>> fashion to inspect what objects there are.
>>
>> Anyway, do the acpi_call hacks to various nodes that have _BCM in them
>> and see if setting any of them changes your brightness.
>
> Nothing here changed the screen brightness. If you have another
> suggestion i'd be happy to try it.

Not ACPI, but maybe a way that will work:
https://forums.freebsd.org/viewtopic.php?f=12&t=44146&p=249316