The problem began a few weeks ago when my display started to flicker on the login screen. Recently the flickering became much worse, especially when browsing the web. Any update to the image on the display causes flickering. When it's at it's worst, even typing causes it to flicker and the screen will go completely black.
What I've tried:
I have two graphics cards installed, but switching between them (using AMD Catalyst Control Center) does not help. The problem also persists when booting into my Windows 8 partition. Restarting the computer sometimes helps temporarily. The display does not seem to be affected at all by jiggling or tapping. I stripped a screw trying to open the computer up, so I haven't been able to check for loose connections or other damage yet.
Intel Corporation Haswell-ULT Integrated Graphics Controller
AMD Radeon R9 M275X
My computer is a Lenovo Y40-70 Laptop.
Also had Ubuntu 12.04 installed, which was listed as a problem in some similar questions I found. Removing Ubuntu 12.04 had no effect.
I now think that this is a hardware issue with the screen itself. When I turn the display back-light completely off and shine a light at the screen I can see that the pixels are still being rendered and there is no flicker.