Around the holidays I build a new system. The high points, in this case, are a RTX-2080Ti and a Acer Predator X27 bmiphzx 27" 4K UHD monitor. I can't say enough good things about how gorgeous gaming is (Far Cry 5 looks jaw drop gorgeous). The monitor is hooked to the PC with a displayport cable (I bought a 15' Amazon Basics one).

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The issue is, I can't adjust brightness. I'm running Windows 10, and if I look @ display settings, for this monitor, HDR & WCG is turned on. It seems with that on, I can't change the screen brightness through Windows. OK, so let's try the monitor's OSD. It seems that on the OSD those 2 options are currently greyed out.

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Generally it hasn't been an issue, but there are times when I'm tired that the stellar brightness is just too much for me when looking at a screen with a lot of white (say, Facebook).

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The other factor which makes me think something isn't quite right is that if I try to use the windows snipping tool, anything I snip has completely blown out color, like someone has cranked the brightness up wayyyyyyyyyyy too high.

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Help? Suggestions? I will be happy to provide any further info. I've done searches and it seems others have had similar issues (with other hardware) but I never saw any real solution.