Yes, confirmed this works, so your diagnosis looks correct :)

I did the following:

1) Set up a spanned laptop + external display configuration. This works,
correct?

Correct this works fine and the main display works at my full resolution
1900x1200

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.

Correct, this turns off the laptop display, moves all windows onto the
main display and the main display stays at full resolution with no
problems.


3) Report whether or not (2) turned off your internal display without breaking 
your external display :)

Yes!

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
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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