Originally Posted by AaronP
Does this problem still occur if you check the "Make this the primary display for the X screen" checkbox for the laptop monitor in the nvidia-settings display configuration page?
When I select this check box and move second screen to the left side of the primary screen, part of the content of the primary screen is on the second screen and desktop becomes unresponsive.
I have set a driver option:
Option "TwinViewXineramaInfoOrder" "DFP-0"
and with this settings switching off TwinView leads me to either crash or blank screen.
Surprisingly, now it worked fine (!).
What confuses me - when I want to switch TwinView, it actually switches off the screen, which is currently highlighted - how can I force DFP-0 to be always on and always a primary screen regardless what I attach to the external monitor's port?