My laptop is DELL G15 5511. It works right on windows, with 2K @75hz full rgb output hdmi. But it not work on linux. When I force set (xrandr --output HDMI-0 --mode 2560x1440 --rate 75.00 --output DP-4 --off) . then the screen become black and no more image output, what I can do is change to tty F1, then restart lightdm. The output hightest set is 2K @60hz with full rgb, it can not set to 2K @75hz with full rgb or limit rgb on nvidia-settings . Finally I found it can be set 2K @75hz on YCbCr422 limit or YCbCr444 color mode on nvidia-settings. I really not know how to fix it, I found some solution was add xrandr opintion with -set "Broadcast RGB " "Full ", but it is only to be useful on intel and amd graphical card, not working on nvidia. BTW, it is all right on inside screen, it can be output on 1080P @ 165 hz full rgb mode, bath on windows and linux. The linux driver version is 560.35.03.
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