Can't wake monitor up from suspend/hiberate

[lemmy999]

I am using Xbian with a HDMI to DVI cable. I can control Xbian using Yatse. Problem arises when i pause a film with a view to watching the rest of the film later. The screen dims after a little while but there is no way that i can wake the Pi up later to resume my viewing. I have tried using a wired mouse but that does not work either.

I am guessing that i need to turn the screensaver off but can't see how to do that from within the GUI. Am I correct? And if so is there a way to achieve this via the CLI?