Is there a way to make X treat Linux framebuffer device (e.g. /dev/fb0 backed by virtual framebuffer) as a real display? Ideally it should appear in system display settings as a configurable monitor. Does it require writing some kernel code or it's possible to somehow get away with for example editing X config files or using xrandr? If yes, is there a way to do this after boot (hotplug)?
Thank you for any advice and related information.