Hi Joel,
while using nvidia official drivers I would change brightness in two
ways:
1) execute in shell as root:
nvidia-settings --assign Brightness=X
where X is a value between -1 (lowest brightness) and 1 (very very
high brightness, useful if in direct sun, otherwise 0 is quite OK).
2) execute the graphical interface:
nvidia-settings
the nvidia configuration tool opens where, among other things like
configuring other displays, twinview, etc., you can manually change a
slider that selects a certain screen brightness.
To lower power consumption you may also try the tips here where most
should apply to Gentoo:
http://docs.fedoraproject.org/en-US/Fedora/14/html/Power_Management_Guide/Example_Laptop.html
Kind regards
David
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