linux-kernel - Brightness control for MacBook Pro

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Date:	Thu, 11 Feb 2010 21:38:45 +0100
From:	Soeren Sonnenburg <sonne@...ian.org>
To:	mjg@...hat.com
Cc:	nicolas@...chat.ch, felipe_alfaro@...uxmail.org,
	Julien BLACHE <jb@...ache.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Brightness control for MacBook Pro - Nvidia 9400

Dear all,

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

02:00.0 VGA compatible controller: nVidia Corporation G96 [GeForce 9600M GT] (rev a1)
03:00.0 VGA compatible controller: nVidia Corporation C79 [GeForce 9400M] (rev b1)

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...

Thanks!
Soeren
-- 
For the one fact about the future of which we can be certain is that it
will be utterly fantastic. -- Arthur C. Clarke, 1962

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