Re: Brightness control for MacBook Pro - Nvidia 9400

[Julien BLACHE]

Soeren Sonnenburg <sonne@xxxxxxxxxx> 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@xxxxxxxxxxx>                                  GPG KeyID 0xF5D65169
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/