Console output?

[lnrt80 at openmailbox.org]

I have a annoying problem with FreeBSD 10.0-STABLE that I don't know how 
to fix.

If the monitor is switched off or another video source is selected, 
FreeBSD for some reason disables screen output on the system, so when 
switching the monitor on again or selecting the previous video source, 
screen output is no longer present and the monitor can't detect any 
signal from the FreeBSD system, exactly as if the system was shutdown. 
The only way to restore screen output is by rebooting the system with 
the monitor switched on, and I don't think that rebooting the system 
everytime we need to do work from the console is a satisfying solution.

I can rule out hardware problems as various Linux distributions have 
been installed on the same setup and the problem described is not 
present, the behaviour is only seen with FreeBSD.

I would really appreciate any suggestions, hints, comments or anything 
else that could point me in the direction of a solution, as this problem 
is driving us nuts.