Here is my screen image. The external monitor works perfectly but the internal laptop screen has no color, nor no visible images at all. I have no idea how it is messed up like this. One thing suspicious is that the graphic driver. It is built in HD4000 from i5-3317U, but at All Settings - Details - Grahpic shows unknown. I updated all of my system, and ubuntu version is 12.10.
here is my photo, I can't upload it since I have no reputation yet...