vm-bhyve virtualised FreeBSD 12 with graphics - which video driver to use?

[Arthur Chance]

I'm trying to run FBSD 12 under vm-bhyve so I can try out various
alternate graphical desktops without disrupting my real machine. Which
video driver do I need to install to get Xorg to work?

The vm is configured with UEFI boot and VNC graphics. The host system is
amd64.

-- 
The number of people predicting the demise of Moore's Law doubles
every 18 months.