From: Shea Levy <shea-yfkUTty7RcRWk0Htik3J/w@public.gmane.org>
Subject: Macbook Pro 5,3 Video Issues
Date: Tue, 20 Mar 2012 18:09:07 -0400
Message-ID: <4F690003.1040404@shealevy.com>
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Hello,

On my system (Linux 3.3, booting in EFI mode, using Nouveau with 
nouveau.noaccel=1 due to 
https://bugs.freedesktop.org/show_bug.cgi?id=27501 ), I can't figure out 
how to change the backlight or switch which of the two graphics cards (I 
have an Nvidia 9600M GT and a 9400M, both are recognized by nouveau but 
only the 9400M is ever used) Linux uses for the framebuffer or X uses 
for the output. I have /sys/class/backlight/nv_backlight, and writting 
to nv_backlight/brightness does change the value in 
nv_backlight/actual_brightness, but no actual screen changes occur. I'm 
using the in-tree staging version of nouveau, so I wasn't sure which ML 
this should go to.

Cheers,
Shea Levy