Nvtv can enable, activate and configure the TV output of most NVidia cards, and some others, such as some 3dfx ones. Nvtv probes and uses the PCI bus directly, thus does not need any kernel support, and allows a very low-level access to the multiple TV encoder chips supported. Then you have a direct control over the registers of the chip, and can use all the resolutions and sizes the board supports. Most of the accesses done by Nvtv need root privileges, and a daemon is provided to allow non-privileged users control the TV output of the graphics card.