Question When I turn on HDR, desktop gets brighter for a second, then dims a second later. Is this normal?

[Crom808]

Monitor: 49" Samsung Neo G9

Hey guys. I have a quick question about this monitor. Appreciate any help I can get. Thank you!

(Monitor Firmware 1011 / Running windows 10 with a 4090) So I just bought the Samsung 49" neo g9 monitor and I just recently noticed when I switch from SDR mode to HDR mode on the desktop, in display settings, the computer screen turns black for a second (I know this is normal), then it turns back on. What I noticed today, that I didn't yesterday is, after turning on hdr mode from SDR mode, the screen goes to black, and when it turns on again, the desktop looks a little brighter, and 1 second after, it dims. I didn't notice it doing this yesterday, is it normal? I have local dimming set to auto.

Here is a quick video of me switching from SDR mode to HDR: https://imgur.com/a/pI5rGv7

***UPDATE*** I changed the wallpaper of my desktop to something that wasn't black and so dark. It was a lighter blue wallpaper (Starfield wallpaper), and it didn't dim after switching to hdr like the video above. So I assume this is normal and the local dimming zones are doing it's job with the first wallpaper that was dark?

 

[NanoSuit3]

It's either a hidden DCR (Dynamic Contrast Ratio) affect or it's just an Ambient Lighting Curve. Shouldn't be too concerned however if it starts to peak outside of the brightness zones or not work after a bit than you should start worrying........................................