Kernel 3.10.x results in black screen on laptop only

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http://ubuntuforums.org – I have an Asus UX31A and I've been regularly upgrading my kernel from the mainline kernel builds page. The updates seem to helping with minor finicky things that don't work. However, the 3.10 series doesn't seem to work right on my machine. The issue is that the laptop screen is black. At first I thought that maybe X was crashing, but I can hear my DM (KDE) logging in. Out of curiosity I plugged in an external monitor, and to my complete surprise it works just fine. The desktop gets extended to my external monitor and everything seems to work. As far as KDE monitor manager can tell the lapt (Hardware)