i have the same problem with my good old gforce2 mx 400 under freebsd - but under windows 98 with a really old driver (maybe the elsa one, it's a gladiac 511 tv-out 64) or any new nvidia driver with help of tvtool) i have a great full screen picture without any boarders on tv with mediaplayer and all other apps (twinview crt/tv).
so it is possbile, but under bsd and apparently under linux there is it a problem?
i don't understand?
are there really so many different digital video encoder chips for pc gfx-cards?
my card has conexant bt869 an i think many cards have the same or a compatible chip. can you please add support for overscan for these chip family? or make your kernel module a bit opener / expandable?
reverse engieneering consumes so much time, particularly if man is not in exercise