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There must be another joint somewhere, you should be able to trace it. Unless you are talking about one of those multiplexed switches wheres the connections are in row and columns.
You can wake up your laptop from serial port, and shut it down too....this all depend if your laptop supports it.
The wake-on-ring pin on serial port can wake up the laptop when the modem rings on that port.
You can then shutdown by setting up a fake UPS connected to the serial port.
You obviously not gonna connect a real modem and UPS on the comport, just wires applying a "high" or "low" on thoses pins...and yes they do take 12V. Just be sure to put a protection diode and resistor in series.
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