Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "DP-0"
Option "MetaModes" "DP-0:3840x2160 {ViewPortIn=1920x1080,ViewPortOut=3840x2160+0+0,ResamplingMethod=Nearest}"
EndSection
Section "Monitor"
Identifier "DP-0"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
#VendorName "NVIDIA Corporation" # not really required
#BoardName "NVIDIA RTX A3000 Laptop GPU" # not really required
BusID "PCI:1:0:0" # adjust this for your system
#Screen 0 # this may not be required for your system
EndSection
My laptop’s EDID only lists 3840x2160 as the single supported resolution and the NVidia driver defaults to not permitting “doublescan” modes which might have worked to produce a 1920x1080 resolution.
Adjust DP-0 above to the actual display alias.
Most important thing to note: ResamplingMethod=Nearest is not the driver default, the default is Bilinear, which in this case of an even resolution multiple causes a noticeable and undesirable blur.