force HDMI output for VNC

On the Pine64 to get x11vnc going I used to add the following to /boot/config.txt:


I've looked at creating an xorg.conf file but the configure fails since I don't have a screen connected atm...

So how to force hdmi output on the Rock (Debian image)?
Not sure why exactly but a "sudo apt-get install xscreensaver" seems to have solved this, x11vnc is now stable on a headless Rock.

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