app-misc/brightnessctl
This program allows you read and control device brightness.
Screenshots
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brightnessctl-9999~amd64 ~x86systemd udev
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Download 
Browse License: MIT Overlay: nitratesky -
brightnessctl-0.4amd64 x86udev
View Download Browse License: MIT Overlay: nitratesky
Reverse Dependencies
Reverse dependancies are sometimes conditional based on your USE flags, Ebuild version and sometimes other packages. please keep this in mind.