Re: TwinView MetaMode issue in 7174 on Debian 2.6.10-6 Asus GeForce FX-5200 128MB
The NULL metamode is meant for games. When the NULL mode is set for a game, the game will display on only one device which is useally what you want. What you plan to do is not possible with this twinview configuration. The only way to do it would be to launch an extra Xserver with only one monitor. When you switch to this server (assuming it is :1 then you can switch to it using ctrl-alt-f8) then the other monitor will turn off. You can run both Xserver sessions (twinview and non-twinview) at the same time.