Public bug reported:

When I connect my XPS 13 (12.04 fully patched) to an external monitor
via mini display port, I can mirror and extend no problem.

However, when I disconnect the monitor the laptop display blanks and
does not come back on.

I tried turning off the external monitor in system prefs before
disconnecting but no change.

Oddly I can get the laptop display back on if I reconnect the external
display, even though it will not show anything.

The only way out seems to be a restart.

** Affects: sputnik (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1181481

Title:
  Disconnecting from external monitor - no laptop video

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