Re: Ad-hoc second monitor problem
I noticed the issue with turning on TwinView with nvidia-settings and do the following to get what I want:
when I mark my laptop's DFP as a primary display and press "Apply" button, additional monitor gets primary (setting “Make this the primary display for the X screen” is ignored). Then I press "Cancel" on "Would you like keep current settings?" dialog box. Then I simply press "Apply" button again (making no changes in configuration!!!) and then my laptop's DFP stays primary.
This issue is present for a long time. It should be fixed because it is annoying...