MacBook Pro v.3  (Santa Rosa) running Ubuntu 8.10 , kernel 2.6.27-11-generic ,  
has problems with backlight.
The module  "mbp_nvidia_bl"   does not load by default.   Loading the module 
manually and writing the desired back-light value  (a number between 1 to 15)  
to  /sys/class/backlight/mbp_backlight/brightness solves the problem.   (You 
need to "sudo -i" )
Note that when you connect the laptop to power, the back-light goes back to the 
default value (i guess 15) , in which case you have to set it to 15 and then 
set it to your desired value the way I mentioned above.

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Backlight control does not work on MacBook Pro 3.1
https://bugs.launchpad.net/bugs/226894
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