You can use a dummy plug in the cypress if it has a VGA port as mentioned in this forum.
Does a Cypress exist that has a VGA port? Didn't know that... :-P
Or is a DVI->VGA dongle enough?
We already use a dummy plug to have the card come alive, but when it is alive, Windows likes to use it as a desktop. This uses memory/resources on the card which we would like to prevent.