How to display boot sequence on external screen?

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http://www.linuxquestions.org – Hey there, I'm currently using an external screen with my laptop at home connected with a serial port. When I'm in X, my laptop display is automatically disabled, when the external screen is connected. Is there a way to do this also at boot time? Where do I have to configure this? Also I'd like to have my login shells on my external screen, when switching to them out of X. Thank you. (HowTos)