After a few minutes Every 15 minutes the screen will go blank for a few seconds. Then it resumes and works normally again. Audio transmission over HDMI is interrupted too when the blank happens. What's that scary feature? Could it be sleep and do I have to disable it in power management options to prevent that? I must admit I haven't seen power management settings ever influence a graphics driver that way before.
edit: Annoyingly it is re-ocurring. Unfortunately it has become a major annoyance. Please help.