CFT: nVidia backlight driver

[Justin Hibbits]

Here's a backlight driver for those pbook/ibook/imac users with nVidia  
chips.  I've only tested it on Peter Grehan's PowerBook 12" (GeForce  
FX Go5200), so it's not tested on anything else.  It _shouldn't_ harm  
the card, but don't blame me if it does :) I'd like to make sure it  
does work on more than this machine before I commit it.

- Justin
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