Unable to do 3 screen HDR

[GodAtum]

I have a 3090 with the current drivers and all Windows 10 updates. I have 3 LG CX TVs attached via these HDMI cables.

But I can only enable HDR on one monitor at a time, and not 2 or all 3.

 

[yashiro]

Are you using them as 3 individual screens or are you using Nvidia surround to arrange them? Nvidia surround probably doesn't work with HDR. It didn't in the past anyway.