linux-kernel - Re: Brightness control for MacBook Pro

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Date:	Fri, 12 Feb 2010 00:13:32 +0100
From:	Soeren Sonnenburg <sonne@...ian.org>
To:	Matthew Garrett <mjg59@...f.ucam.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, 2010-02-11 at 20:44 +0000, Matthew Garrett wrote:
> On Thu, Feb 11, 2010 at 09:38:45PM +0100, Soeren Sonnenburg wrote:
> > Dear all,

Hi Matthew,

thanks for the quick answer.

> > 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...

Unfortunately nouveau (from kernel 2.6.33-rc7) just hangs after loading
firmware and initialising fifo 1...

> > 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.

I see...

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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