xrandr --output DP-1 --mode 3840x2160 --pos 0x0 --scale 1x1 --auto \ --output HDMI-1 --mode 1920x1200 --pos 3840x0 --auto --panning 3840x2400+3840+0 --scale 2.0x2.0 \ --fb 7680x2400
# setting UI scaling: gsettings set org.gnome.desktop.interface text-scaling-factor 1.7
https://wiki.archlinux.org/index.php/HiDPI
https://askubuntu.com/questions/968443/nvidia-drivers-unable-to-check-force-full-composition-pipeline
https://devtalk.nvidia.com/default/topic/1027345/linux/why-cannot-i-enable-drm-kernel-mode-setting-/