4.11 Selected Screen Does Not Display

Problem  

I can configure the screensaver displays in the configuration panel, but when I preview the screensaver display, or specify a blank screen, my chosen screensaver display does not appear.  

Solution  

XScreenSaver only enables graphical screensaver displays on machines that are running DPMS (Display Power Management System). You can enable DPMS with the following command: xset +dpms

Sun Ray^TM clients do not run DPMS.