VGA-->HDMI Converter Box only does 4:3. I want it to do 16:10. Is it possible to force the resolution?

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http://askubuntu.com – I purchased a Monoprice VGA-->HDMI adapter (my Thinkpad X201 laptop only has VGA out). 12.04 displays via the box, but only gives me the option of 800 x 600, or 1024 x 768. Straight VGA cable to an external monitor would give me 1920 x 1200. Is there a way for me to force the external connected HDMI (through the converter box) to display at higher resolution? the box is capable of running at this resolution. (HowTos)