Today I learned that there’s a utility called ddcutil for Linux (sudo apt install ddcutil) that you can use to set the brightness of external monitors.
e.g., on my machine, to set the external monitor to 30% brightness:
sudo ddcutil setvcp 10 30
(Should make a good feature alongside Night Light in elementary OS.)
@aral ddcutil is also a godsend for switching between monitor inputs with e.g. some global key bindings, which can in some cases help you forego an expensive kvm switch!
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