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When I change the screen resolution of my laptop from 1366x768 to 1024x768 via [Displays ...], the entire screen is still filled. How can I have a 1-to-1 mapping such that the original proportions are preserved?

This I need particularly when I want to mirror the screen together with a beamer.

(In 9.10 it somewhat depended on the displays available at startup. If a lower resolution screen was added later on, proportions were retained)

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Look into xrandr on Ask Ubuntu –  don.joey Mar 6 '13 at 8:51

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