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Provide an emacs front-end to light. This is a tool that controls the brightness on laptops. To install light, sudo apt-get install light Install light setuid (sudo chmod u+s /usr/bin/light) This module is most easily used in conjunction with hydra: M-x package-install hydra
Black screen.
Decrease brightness.
Get brightness level.
Increase brightness.
Set brightness. (fn BRIGHTNESS)
White screen.