Finally, say bye bye to jumpy cursor on Dell Precision 6600

I was using my Dell Precision 6600 for a long while, and if there's one thing that piss me off the most, it will be the trackpad.  Frequently I found the edge of my palm accidentally hit the trackpad, causing the cursor on the screen suddenly jump to another location, and made my writing or coding life like hell.

Today I finally disable this damn trackpad once and for all.  In the BIOS setting, I expanded the "POST xxxx" (forgot exact wording) setting, and select "Serial Mouse", meaning that if a "Serial Mouse" is connected, then the trackpad will be disabled.  Turns out it also works with USB mouse.  So now the trackpad is being disabled with my USB mouse connected, and all the great now.