This question already has an answer here:
I'm running a custom version of raspbian on my raspberry pi, it has no X server running only in text mode with only basic services installed. i got a usb monitor that i want to plug in and use to show the console, i plugged it in it's detected and showing a green screen but i'm not sure what i can do to achieve my goal if that's even possible. Any of you can give some pointers ?
[ 1606.712232] udlfb: DisplayLink LILLIPUT USB Monitor - serial #70873920033 [ 1606.724237] udlfb: vid_17e9&pid_02a9&rev_0130 driver's dlfb_data struct at b8d6d800 [ 1606.741459] udlfb: console enable=1 [ 1606.749754] udlfb: fb_defio enable=1 [ 1606.757827] udlfb: shadow enable=1 [ 1606.766183] udlfb: vendor descriptor length:17 data:17 5f 01 00 15 05 00 01 03 00 04 [ 1606.782954] udlfb: DL chip limited to 1500000 pixel modes [ 1606.794348] udlfb: allocated 4 65024 byte urbs [ 1606.885797] udlfb: 800x480 @ 59 Hz valid mode [ 1606.894588] udlfb: Reallocating framebuffer. Addresses will change! [ 1606.906132] udlfb: 800x480 @ 59 Hz valid mode [ 1606.914741] udlfb: set_par mode 800x480 [ 1606.927843] udlfb: DisplayLink USB device /dev/fb1 attached. 800x480 resolution. Using 1504K framebuffer memory