According to MIMO, using the RPi 3 with USB Displays is said to be much easier as the required Kernel components are said to be part of the stock build. I did find that plugging in a Mimo Display into the RPI 3 did turn screen solid green. They say this is a sign that the display is recognized, and the driver is loaded. The green screen says that the Pi doesn’t know what to display on it.
The two frame buffers fb0 and fb1 are present in /dev. fb0 is said to be for the onboard RPI display port and when I plug in the MIMO fb1 appears indicating the USB display.
I tried various configurations including: /etc/X11/xorg.conf.d/60-plugable.conf and /etc/X11/xorg.conf. Neigher worked. The screen is still not displaying volumio, just green.
Option “fbdev” “/dev/fb0”
Option “ShadowFB” “off”
Screen 0 “screen” 0 0
How to set (options udlfb fb_defio=1)
Is volumio running straight X?