Similar issue for Dual Discrete Display card AMD+GeForce

I wanna blacklist nouveau for the Geforce VGA Passthrough via VFIO 
but then the screen on ATI is flickering on the tty login screen but not to 
Gnome. The keyboard NUM lock light is flickering as well and it is hard to work 
for typing the password
After flickering for a while, my keyboard works normally and I can login in 
command line.

However the screen flickers again when I type service gdm restart, I
still fail to get in GNOME.

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  Ubuntu GNOME boots to black screen when using proprietary Nvidia
  drivers on a laptop with Optimus

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