Do you use kernel modesetting? If yes you should not be able even to boot 
normally, not even talking about starting Xorg, if you have the same problem.
But if i understand correctly the kms driver check if something is actually 
attached to the port and if not bails out appropriately ;-)
You might be able to tell him to go ahead though.
In any case no modesetting should get you going further (i915.modeset=0 on the 
kernel command line).

-- 
after first splash boot, screen flickers displaying a bunch of drm: failed to 
restore crtc configuration
https://bugs.launchpad.net/bugs/467841
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