Bug#884638: linux-image-4.9.0-4-amd64: Display cuts to black and back w/ intel gpu/fifo underrun

[frederik@dannemare.net]

I can confirm this. For my Lenovo ThinkPad T450s with 2 external 
monitors, it is exactly the same. Drove me nuts for the better part of a 
day until I realized it was due to 4.9.0-4. As such I'm also back to 
running 4.9.0-3 as a workaround.

In my case I would only* get the flickering (ie. the screen/monitor 
goes blank for a sec or two) in the following scenario:

1) move mouse cursor inside of my GNOME Terminal window
2) use the keyboard to type something (anything)

*With the mouse cursor hovering outside of my term window, I was safe 
so to say. Having said this, occasionally a monitor would also flicker 
when moving the mouse cursor from one external monitor to another.

B/R,
Frederik Dannemare