O.K.! BIOS is the latest, of course. NUC is directly connected to Panasonic Plasma TV. Nothing changed. With the upcoming Ubuntu 14.04 it should work everything fine. If not, i will be really curios about Intels further statements...
Dont forget: The NUC are officially "Linux-Compatible". So i really would appreciate, if the Linux Support outside of Kernel-Developers is getting more than a fashionable phenomenon.. Thank you anyway!