Adjust X11 resolution on the fly
Modern X11 drivers support resolution changing on the fly (as in, you don’t need to restart your X11 server). You can check if your driver supports this when you see this
(==) RandR enabled
(II) Initializing built-in extension RANDR
(II) Initializing built-in extension RANDR
Changing the resolution is very easy:
xrandr –size 1024×768
Entering xrandr without any options shows all the available resolutions.