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Actually, most monitors support the DDC/CI protocol [1]. But I think implementations tend to be spotty hence Windows (for example) doesn't show a brightness slider in some configurations. Third party apps exist though (e.g., TwinkleTray [2]).

[1] https://en.m.wikipedia.org/wiki/Display_Data_Channel

[2] https://twinkletray.com/



FINALLY! Someone remembers! There even was a monitor remote control panel in NVIDIA Display CP in Windows 98 or 2000. It was awesome!




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