Comment # 23 on bug 1104851 from Dr. Werner Fink

(In reply to Stefan Dirsch from comment #22)
> Too bad. But thanks a lot for giving it a try!

No problem ;)

The only nasty thing is that the BIOS of the CPU detects which line of the
monitor is enabled (Display Port or HDMI1) and you have to reset the system to
be able to switch and seee something. And there is no option in the CMOS/BIOS
to ignore this ... only the order of using Online or PCI/PCI Express can be
changed but no headless configuration is possible ;}