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OK here's my long term report on this problem:
I've had the laptop installed in my car since december using the same cheapie DC to DC converter. The laptop still works great both on AC and on battery with no noticeable battery degredation. I'd say 3 out of 4 times, the laptop "magically" turns on with the ignition. Convenient? not really. It has to work 4 out of 4 to be convenient. So my advice would be don't rely on it as a startup controller.
Recently I decided to invest in a real startup/shutdown controller (M2-ATX modified to work with my lappy) but here lies the new problem. When I turn the ignition on, the laptop fires on its own as before... but then the pulse from the M2-ATX turns it off defeating the controller. Aargh.
Back to the drawing board on this one.
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