How do I disable a laptop';s build-in keyboard on ubuntu?

whang2011

I have a Kinesis keyboard that I ideally like to use by placing it on top of my laptop. When I do that, I wind up pressing keys on the built-in Dell XPS 17 L702x Laptop Keyboard with my external keyboard.
I';ve been playing around with the GUI keyboard controls and reading the ubuntu forums for a couple hours without really any forward progress. Even a hacky solution or a pointer to a good library for configuring multiple keyboards differently would be much appreciated.
thanks.