linux-kernel - Re: Brightness control for MacBook Pro

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Message-ID: <878wayk8hn.fsf@sonic.technologeek.org>
Date:	Fri, 12 Feb 2010 12:18:28 +0100
From:	Julien BLACHE <jb@...ache.org>
To:	Soeren Sonnenburg <sonne@...ian.org>
Cc:	mjg@...hat.com, nicolas@...chat.ch, felipe_alfaro@...uxmail.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Brightness control for MacBook Pro - Nvidia 9400

Soeren Sonnenburg <sonne@...ian.org> wrote:

Hi,

> I am booting a MacBookPro5,3 using elilo and efifb. Now I'd like to use
> pommed to control display brightness (which won't work). Digging around
> in mbp_nvidia_bl.c I figured out that tries to control the geforce 9600M
> instead of the currently active geforece 9400m

If you know how one can determine which GPU is active, let me know. I
don't have this information at the moment.

> Does anyone have an idea which bytes to tweak to change brightness
> levels for the 9400? Seems like 0x52f does not work - at least
> setpci -s 03:00.0 0x52f.B=10 fails...

I'm not sure this method actually works without the legacy BIOS. IIRC
that method was determined by reverse engineering the Windows drivers,
which means the legacy BIOS was in use.

JB.

-- 
Julien BLACHE                                   <http://www.jblache.org> 
<jb@...ache.org>                                  GPG KeyID 0xF5D65169
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