Smaller desktop size but preserving screen resolution (add borders)

Does anyone know if it's possible to add borders to my screen (the device) (using xrandr maybe)?
I have some old TV which has HDMI connector. It can show 720p resolution. Problem is that, for some very odd reason, it cuts about 20px from _every_ side, thus leaving the top bar on my desktop hidden, which is more than annoying.
I believe the problem is on the software on that TV. I actually work on a place where I could have access some service manuals of this TV. So far I haven't found any way to correct this problem. Unfortunately I cannot upgrade the software of that TV because we have services only for household machineries which don't include TVs. Thus we don't have proper equipment for upgrading the software.
Soooo this bring me here: asking you if it's possible to set desktop size little a smaller to fit it on my TV. I'd like not to have it configured on XOrg's confs because I normally use my second monitor in place of that TV and with my intel GPU (on laptop) I cannot have more than two monitors connected at the same time.
In case if it's relevant I use awesome (wm).
Thanks in advance!

Oh, I HATE that! It's called overscan.
A mythtv thread here may help you fix it.
The only thing I use my TV for is to watch videos using mplayer. Even though the borders of my desktop are cut off because of overscan, mplayer seems to "just work" and play the videos correctly.

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