OK, it took me longer than I thought to make the videos but here they are.
The first and second video show “normal” screen flickering, the third one shows the effect of searching for wifi networks (screen flickering increases).
Video 4 and video 5 show the worst case when after severe screen flickering the screen freezes and goes dark. I just looks like the screen dies. When I watch this process for some time, send the notebook into hibernation and wake it up again, it takes some time for the screen to recover. For several minutes the edges of the screen are brighter than the rest (see this picture).
@veggies Is this the flickering you are seeing or are we talking about different issues?
@mladen Could you please have a look at this. Is this a known problem?