It might be Wayland. I use a 4k display with Ubuntu gnome on xorg and it works fine. Just pick a resolution, dpi scaling and font size in tweaks that looks nice

It might be Wayland. I use a 4k display with Ubuntu gnome on xorg and it works fine. Just pick a resolution, dpi scaling and font size in tweaks that looks nice together and you're good to go. Look into libunput gestures for the touchpad too if you get the chance.