Disable internal display on Macbook Pro without closed lid mode?

"I think your solution is going to include kernel modification. I don't know if you are up for the task, but you can try either booting without the following kernel extension:

/System/Library/Extensions/AppleOnboardDisplay.kext

Or finding a replacement for it from a source like those used by the hackintosh community.

I think I would try working without it at first...

Move the file to a ...kext.back, clear the kernel cache and reboot. If you have any trouble boot with verbose mode (-v) and have a look at the error codes."