My X window config: .xinitrc

First, install stumpwm, xrandr .

then, add a file ~/.xinitrc

xrandr --output VGA1 --mode 1920x1080 --rotate left --above LVDS1 --primary
xrandr --output LVDS1 --off
/usr/bin/stumpwm &
/usr/bin/xterm

Finally, in terminal

startx