weird screen resolution in Ubuntu 12.10

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http://askubuntu.com – I have Dell 7520 with AMD Raedon 7XXXM graphics card, thankfully, I got to make it work. But the problem now is screen resolution, as I have screen resolution of 1920 X 1080 for 15.6" laptop, which is way too much. In the Display Monitor settings, I cannot change it to whatever I want, only the resolution with 16:9 works perfectly. I have options for other resolution setting but, selecting others brings the screen edges near, that means it leaves gap on both sides of screens. And to read contents from such high resolution is too small, as I need magnifying glass. I have other suitable 16:9 re (HowTos)