I've just got a Lenovo Y70 Touch laptop.
Problem: The laptop screen is vibrating, (flickering? shaking? not sure what the best word for it) as if refresh rate was the problem. (17.3" 1920x1080) External monitor through HDMI working OK, no problem.
The problem started from the very beginning, when I booted from the Ubuntu 14.04 DVD.
No problems under Windows 7 and 8.1.