I've installed Debian 8.7 on an Intel NUC7i3BNH and all is fine except for a troubling problem I've got with X-windows.If I boot the system with a monitor attached to the HDMI port, then I can use NoMachine (or vnc) to work with the system just fine.  However my planned configuration is headless, and if I start without a monitor attached then when I connect using NoMachine the display comes up black.  The X-windows X cursor is visible but thats it.This appears to be an issue with the X server and not with NoMachine/vnc.  Xorg is running in the headless configuration and has exactly the same arguments as with the HDMI cable attached, namely:/usr/bin/Xorg :0 -novtswitch -background none -noreset -verbose 3 -auth /var/run/gdm3/auth-for-Debian-gdm-oxeYFk/database -seat seat0 -nolisten tcp vt7For what its worth, I did install Xvfb and got that working fine as a second display but that also comes up blank, so it doesnt seem to help address the underlying problem.I suspect it may have something to do with incompatibility (the NUC is Kaby Lake) but Id really appreciate some advice on how to track the problem down.  Im not an X-windows expert so Im at a loss how to go about it.Any help much appreciated.Configuration details:Debian 8.7 with jessie-backports (kernel 4.9.0-0.bpo.2-amd64)xorg-server 2:1.16.4-1 (http://www.debian.org/support)
Debian 8 on Intel NUC7i3BNH -problems with headless display
debian;x11;headless