Re: TwinView and TV overscan
Are you able to set the option when you use the nvidia-settings gui? Some options like TVOverscan are display specific and that's why it might not work the way you specified it right now. The way you specified it right now would set the option for both screens. You need to specify that it is for TV-0 or whatever. Check the nvidia-settings help or manpage on how to do that but first check the gui version.