Screen resolution repositioning? (Broken laptop screen)

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http://askubuntu.com – I have a laptop with the top left corner's screen being broken - I can't see anything there. However it's just a small corner, so I'd like to know if there's something I can do to make Ubuntu not use that part of the screen at all - I basically want it to ignore 2 unity taskbars on the left, and re-position all the content. (HowTos)