linux-kernel - Re: Brightness control for MacBook Pro

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Date:	Thu, 11 Feb 2010 20:44:41 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Soeren Sonnenburg <sonne@...ian.org>
Cc:	nicolas@...chat.ch, felipe_alfaro@...uxmail.org,
	Julien BLACHE <jb@...ache.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Brightness control for MacBook Pro - Nvidia 9400

On Thu, Feb 11, 2010 at 09:38:45PM +0100, Soeren Sonnenburg wrote:
> 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

So, first of all, use nouveau instead. But moving on...

> 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...

Those are mmio registers, not PCI config ones. You won't be able to 
change them with setpci.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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