[ubuntu] Can't modify screen resolution

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http://ubuntuforums.org – Hello Ubuntu world, I am tiring to change my resolution to 1202x670. I have tried everything I found on the net from XrandR to ArandR even installed a package called Resolution Switcher, but to no avail. Now the reason I need such a bazaar resolution size is because I am running an old Samsung T.V. with HDMI connection and it doesn't play with with PC displays (the HDMI that is, it works fine with VGA). I have this same resolution size for my Windows 7 installation, but I used nVidia's control panel to get it (there's an option in there that you can manually resize (Hardware)