Re: Videogen: creating a 1080p modeline
I haven't done it in a very long time.
One way is to look at the /var/log/Xorg.x.log file when you have lots of resolutions. Each valid resolution should have a corresponding mode line listed. These can be extracted and put in a /var/X11/xorg.conf.d file for the device. These indicate what the combination of your video card and monitor support.
SOME of these MAY be available when theconverter is plugged in. This is assuming the problem is the TV (or converter) is not providing a proper EDID identification. You can then use xrandr to select one to find out if it works. Some will, some won't - but I believe xrandr has a timeout and restores things when they don't work.