Ubuntu Multimedia :: The NVidia Overscan And Fixing It?

I have Googled. I have searched these forums and others. I have ripped my hair out in frustration. As many are aware, custom resolutions- "What the hell" by "that's just messed up" or "Jesus Christ" by "you've got to be kidding"- are very hard to set under the new "xorg.conf isn't really used" paradigm. This should not be. Many Ubuntu users are running the OS on displays with either nonstandard display resolutions or devices which overscan the display but do not offer a 1:1 pixel display setting- such as myself, on my 50" Samsung 1080p DLP television, connected via its HDMI port.

After more than a year trying to find a hard-and-fast process for fixing this overscan problem (note that I did not say "a hard-and-fast FIX for this problem"), I have decided to turn to the collective wisdom of the Ubuntu user community in an effort to put this issue to bed for good. To that end, I create this thread.

Recent research via the web has led me to believe that the problem lies in the X server not being aware of any sort of valid modeline for my- or your- nonstandard resolution. I am well-aware that each solution for each user will be different; if you're reading this, you're probably a geek like me in the first place, and your chops are more than sufficient to tackle both biting off this huge issue and chewing it.

My question to the community is this: How do I determine the correct modeline to add to xorg.conf, how do I make it available to the X server, what do I need to do to format the modeline in a valid way in xorg.conf (if necessary), and how do I make it appear in the list of valid resolutions when I run nvidia-settings (or whatever the command is)?

Keep in mind, I'm more interested in establishing the correct pipeline for fixing the problem and allowing arbitrary resolutions to the limit of the given device's capacity, rather than an exact solution for my particular hardware. In other words, I don't want an exact answer for my situation; what I'm looking for is a method for finding the proper solution given situations similar to mine.