Re: nvidia tv out -- not a valid TV mode
First you really don't want a resolution of 1280x1024 on your tv as televisions aren't made for more than 640x480 (NTSC) or 800x600 (PAL). You should twinview using an "extended" desktop and use lets say 1280x1024 on the monitor and 640x480 on the tv. Then use a mediaplayer with xinerama support, so fullscreen becomes 640x480 on the tv. Another option is to use seperate X screens as described in appendix R of the driver readme.