5k Resolution renders weird and dont get the right "screen refresh rate" option

Hello Guys,

I got a new monitor ( Samsung Odyssey G9 C49G94TSSR), this monitor works fine in windows, if I switch to the windows vm (using GPU-Passthrough it dont bugs), but in fedora it still have some bugs. For instance, I cant switch to the 5k-Mode, the resolution buggs totally and I cant select the option of 240 hz, only 120 hz on 4k resoluton and only 60hz at 5k resoluton.

I’m using KDE as Desktop Enviroment and X11. Wayland laggs very hard (I cant use it)

Is there a solution for it?

Best regards