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Question How do I turn the brightness down while i have HDR on ?

I usually use my monitor with all the lights off at night and just recently got a new monitor with HDR 400. It's way too bright at max brightness which is what is automatically set to when HDR is on and I can't change the brightness without turning HDR off.
 
You can find an app for calibration if you press on the link in the settings and you can also use the slider on the same window... at least for desktop brightness.
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You can also try changing it from the drivers.