So I have been struggling with a similar problem on my new asus laptop with windows 8. My touch screen would work intermittently and I could not figure out why. it kept giving me an error stating that the usb port was not getting enough power. (apparently
the touch screen is plugged into the usb hub somehow).
after lots of tinkering and reading forums like this and much prayer (Jesus often answers my prayers to help me figure out computer problems like this... I highly recommend it. If you don't know him, get to know him. He's awesome!)
Anyway, this is the fix (i think... no problems so far).
I went into the power settings by clicking on the little battery icon on the task bar at the bottom of my screen and the clicking on "more power options". it opened up my power options and I chose "change plan settings". from there I chose "change advanced
power settings".
I scrolled down to where it says "intel(R) graphics settings" and opened that up. then I opened up "intel(R) graphics power plan". everything was set to either maximum battery performance or maximum performance. I changed it to "balanced". no problems
since then.
I don't know for sure, but I think the screen wasnt getting enough power and didn't really know how to regulate itself. now that I changed that, it seems to be working just fine.
may God bless your endeavors.