sudo mkdir -p /etc/X11/xorg.conf.d
sudo nano /etc/X11/xorg.conf.d/10-monitor.conf

Section "Monitor"
    Identifier "Monitor0"
    Modeline "1280x1024_60.00" 108.00 1280 1328 1440 1688 1024 1027 1034 1066 -hsync +vsync
    Option "PreferredMode" "1280x1024_60.00"
EndSection

Section "Screen"
    Identifier "Screen0"
    Monitor "Monitor0"
    DefaultDepth 24
    SubSection "Display"
        Modes "1280x1024_60.00"
    EndSubSection
EndSection

sudo reboot