No vidcontrol after update to 10.2

I've just started using a computer which was hidden away for about a year so I thought I'd try an get everything up to date so did a freebsd-update to get to 10.2-RELEASE...

I've just tried to set the video mode using vidcontrol and get:-

root@FreeBSD:~ # vidcontrol -i mode
vidcontrol: getting active vty: Inappropriate ioctl for device

I'm sure this worked previously. How do I set the video mode?

allscreens_flags throws out an error message on boot.

I guess it must have something to do with the wrong graphics driver. How do I tell what chip is installed?