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I use Ubuntu 12.10 (Gnome 3) on a MacBook Air. I would like to connect the notebook to an external projector and mirror the displays. The projector image looks great, however, everything on the notebook is horizontally stretched to fill the physical screen size (the round 'askubuntu logo' is now an ellipse). I remember that with Mac OS X, you could choose 'stretched/non-stretched' versions for the notebook, but I couldn't find this for Ubuntu. I installed arandr and played a bit with it, but as soon as I see a nice display on the notebook, the projector cuts off parts of the screen (for example, a vertical strip on the right side). I would rather see some black bars on my screen but the rest being in proper x:y ratio (for it to be readable) than having the screen stretched out. Any ideas?

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