Re: TV-out quality and overscan
phelin: Do the Technotrend DVB-C, DXR3 or Hollywood Plus take still images drawn with GTK too?
The "streamer" or whatever you'd call the bulletin board kind-of system with information between shows is using GTK to display still images. That's why I suspect it needs to be shown fullscreen on the Linux computer.
The Tview computer-to-TV scan concerters that smp5 mention maybe then are better options, as they also takes the VGA output and converts it to good quality TV format?