Ok - I think I see the same thing, and I think it's actually a gnome-
desktop problem (or, at least, is only triggered by gnome-desktop's
RANDR stuff).  Can you please check whether running "xrandr --output
LVDS1 --off" successfully turns off the laptop panel without breaking
the external display?

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

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Importance: Undecided => High

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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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