I don't have a 1xx series with vid-out to test out on handy at the moment; but try with the lid closed, using an external keyboard.

Works on the Duos (with minidock, of course,) and 500-series.

If you don't have an external keyboard to "permanently" dedicate to it, just boot it with the external KB connected, then open the lid once it's up and running and unplug the external KB.