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I have installed Ubuntu 13.04 on a Lenovo T430s. I connected an external monitor via the VGA port (Samsung SyncMaster 2443). When I go to the Display settings, the monitor appears as "unknown", and the maximum resolution is 1024 x 768.

(The maximum resolution is 1920 x 1200 on Windows 7.)

I tried turning Optimus mode on/off, I tried installing Bumblebee, and I tried installing the latest Intel drivers through intel-linux-graphics-installer, to no avail. How can I get Ubuntu to recognize the monitor and/or enable a higher resolution?

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This guide (https://wiki.ubuntu.com/X/Config/Resolution) can lead you out of desperation and help you understand the problem, this (How to add display resolution for an LCD in Ubuntu 12.04? xrandr problem) would be the quick solution.

There was also a bug on Nvidia cards, and it looks like it is still active. please confirm what is your graphics card type.

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