hdr problem in Windows 10 Fall edition

I have a problem in Windows 10 Fall edition (also with the previous Windows version) when turning HDR on. When I turn HDR on, in Windows 10, the screen gets darker. I can get the screen back to normall when I put the contrast level at 200, but then the games are way to bright.

 

I use the following configuration:

 

AMD Ryzen 7 1700X - Processor

MSI B350 GAMING PRO CARBON - Moederbord ATX

G.Skill FlareX - DDR4

Sapphire Radeon RX Vega 64 8 GB - Grafische kaart

WQHD Gaming Monitor, 27 inch (7-serie) HG70QQUXEN | Samsung

 

I tried to turn local dimming off, on and on auto, on my monitor but everything stays dimmed in Windows 10.

The games (Hitman, Fifa 18, GR Wildlands) I play look ok, but I`m not pretty sure if its hdr. I`m also wondering if I can play games in HDR if the option is turned off in Windows?

 

I`m wondering is this a Windows 10 problem, or AMD problem (not quitte sure, because NVidia has or had the same problem).

 

I found these threats on the internet about the same problem:

 

https://answers.microsoft...-b14c-519ec4a7eb99?auth=1

 

https://www.windows10foru...mic-range-problems.13816/

 

http://www.neogaf.com/forum/showthread.php?t=1399726