Is this a regression from 12.10? The modesetting code in the kernel got
rewritten for 3.7, so testing with 3.5 from quantal might make it work.
Also, try without the KVM box to see if it makes a difference.

What happens if you run 'xrandr --auto' from a terminal after attaching
the external screen?

** Package changed: xorg (Ubuntu) => xserver-xorg-video-intel (Ubuntu)

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1083790

Title:
  Connecting external monitor shows incorrect resolution on external
  screen and correct resolution on laptop screen

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