Thanks for the awesome guide esp. it covers the Ultra Docks configuration. I believe there is not many Dock and hackintosh resources available on the web.
Regarding to my configuration, having Ultra dock 40A2 and connect to 2 external monitors via
a. HDMI - BenQ 27" (default 1080p)
b. DVI - Dell 22" (default 1680x1050)
I can only display the mirror mode on the above 2 external monitors, but not the extended mode.
When I further check the Display setting in System preference, there is only 1 external Dell monitor and both monitors using 1680x1050 resolution. Seems DVI Dell supersede HDMI BenQ resolutions !
If I unplug the DVI connection, then X240 running Catalina can detect the Benq 27" and using 1080p resolution.
It sounds very weird to me.
Has anyone running X240 able to use 2 external monitors for extended mode ?