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Message-ID: <20100212141457.GA18714@srcf.ucam.org> Date: Fri, 12 Feb 2010 14:14:57 +0000 From: Matthew Garrett <mjg59@...f.ucam.org> To: Julien BLACHE <jb@...ache.org> Cc: Soeren Sonnenburg <sonne@...ian.org>, nicolas@...chat.ch, felipe_alfaro@...uxmail.org, Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: Brightness control for MacBook Pro - Nvidia 9400 On Fri, Feb 12, 2010 at 12:18:28PM +0100, Julien BLACHE wrote: > 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. There's a _DSM method in the ACPI tables that you need to execute. > 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. Ah, yes - sorry, I'd forgotten that this used the smi horror. nouveau should drive the chip brightness natively, so it's probably better to figure out why it's breaking rather than worry about this... -- Matthew Garrett | mjg59@...f.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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