Resetting OS X video settings remotely over SSH

One of our Xserves was recently connected to a new KVM via a Mini DisplayPort to VGA adapter.  When connecting the Mini DisplayPort to the Xserve, the video signal was not usable (screenshot below).

A reboot will clear the issue, but why reboot a production server?  Especially this server with over 425 days of uptime!

The fix is to use SSH with the following command:

sudo killall -HUP WindowServer

This will log the user out, and reset the video.  Once reset, all worked again as expected.