In case my previous comment was not clear, what I want is:

1) Set up a spanned laptop + external display configuration.  This works, 
correct?
2) Open up a terminal, and run "xrandr --output LVDS1 --off".  This should turn 
off your laptop panel, leaving only the external display active.  It should 
*also* not break your external display.
3) Report whether or not (2) turned off your internal display without breaking 
your external display :)

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https://bugs.launchpad.net/bugs/861426

Title:
  [Oneiric] [Regression] When disabling onboard LVDS display and just
  using external VGA screen corruption occurs

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