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hey, try ClickMonitorDDC: https://clickmonitorddc.bplaced.net/

It allows you to change brightness, contrast (and volume, never tried it), from the taskbar.

It works for a Dell and iiyama monitor I own, but not my Agon one, so YMMV

I found a freeware program ScreenBright a few years back and use it so that I type “b 0” in my command line to set the brightness to zero. (I tried it out to confirm that this DDC/CI thing would actually work, before I bothered delving into the Windows APIs to write my own CLI; but then figured, since it had a CLI, why bother? and just wrote a batch file around it that contains `@%~dp0\screenbright.exe -set brightness %1 -set screen 2 -set brightness %1` to do both monitors at once.)

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