Stop auto-switch of display when external monitor is attached

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I have a KVM switch between my laptop and my PC that serves its purpose
perfectly.  The only problem is that when I switch from the Laptop to
the PC the Laptop automatically recognises that the monitor is no
longer "attached" and diverts the display back to the LCD laptop
screen.  When I try to switch back to the laptop the device does not
receive a signal and I must manually set the laptop to use the monitor

Is there anyway I can deactivate this auto-switch?  When the KVM is
plugged into the monitor jack (regardless of whether the KVM has focus
or not) on the laptop I always want it to display on the extrenal
monitor only at a set resolution.  When it is not plugged in I want to
display on the LCD only at another resolution.  Is there are way to
achieve this?

KVM: ServerLink SL-271-C - 2 Port Star Cable KVM - PS/2 & USB with
Monitor: Acer AL1715 LCD Monitor
Laptop: Acer Aspire 2000


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