Can you please boot with drm.debug=0x0e and attach the dmesg? Also the
output of xrandr --verbose with the displays plugged in and a copy of
~/.config/monitors.xml

** Changed in: linux (Ubuntu Natty)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/752904

Title:
  [Lenovo L420] Unable to attach a monitor through VGA/Displayport

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