Windows 10: [HDR]Turn on the HDR when playing 4K HDR video

I turn on the HDR when playing 4K HDR video, I found that the video image was overexposed. After suspending the video, it could be restored to normal. May I ask why this phenomenon occurs and is it normal?

:)

 

When I play HDR video Windows HDR automatically turns off

The title explains it. I've been trying to watch a 4K film through VLC, and I am able to turn Windows HDR on (meaning my computer should support it), and my TV is 4K (I connected PC to tv via HDMI cable). But when I actually play the video HDR just turns off by itself.

 

Windows wont display 4k and HDR simultaneously.

I recently got a 4k HDR tv (Samsung UE43NU7100). I connect my PC with a normal HD monitor and the 4k HDR tv. When turning on HDR on my tv the resolution of the 4k tv (3840x2160) gets set back to normal HD (1920x1080) in windows settings. Windows is completely
updated, my AMD Radeon R9 390 8gb graphics card is up to date and supports and displays in 4k when HDR is off. My Xbox one X displays both 4k and HDR perfectly simultaneously. I use a high speed HDMI 2.0 cable. I have no idea why my pc does this and cant find
anything about windows not being able to do 4k and HDR at the same time. It also doesn't work if I only connect the tv instead of the monitor and tv. Any suggestion?

 

HDR won't enable!

Thanks for your suggestion. I lowered the refresh rate to 30 HZ and still could not toggle the HDR switch to on position.

I also checked the play back with powerdvd17. My projector information recognizes 3840 x 2160 p 60 Hz with HDR 10 BT 2020 when I play a 4K HDR source file

Thanks