On a Lenovo Edge 13" (Intel Version) I have major problems with external
displays, which was very embarrasing during a presentation.

When I switch to the external display only, top bar shows up perfectly
but the rest of the content is only shown in a window of the size of the
prvious resolution (the laptop resolution)

when I use the external display in extended desktop mode, the top bar is
shown but the rest of the desktop remains black

when giving the same output to both screen, everything semmed to work
fine in the beginning, but in the fullscreen presentation, grafical
artefacts appeared where the top bar is located

only thing taht worked so far was to switch to external display only and
then restart gdm.


Very annoying and a total showstopper, you can't use natty for professional 
presentations at all which is very bad I think...

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https://bugs.launchpad.net/bugs/753971

Title:
  Display garbled when connecting external displays

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