Displaylink recently released the Extensible Virtual Display Interface, a linux kernel module that adds a virtual graphics output. It is released under the GNU (L)GPL and used by their DisplayLink Manager. When I was reading the POWER9 Hardware Compatibility List, my assumption that USB3.0 DisplayLink devices do not work with POWER9 was correct. The source code of the DisplayLink Manager application is not published, and there are no binaries for POWER9 either. Since the kernel module is free software that comes with good documentation, I began writing my own replacement for the DisplayLink Manager, which allows me to use the built-in screen of a ThinkPad X200 as a second display, and also indirectly connect a third Monitor via HDMI.
