I've just done some further testing. The behaviour varies depending on
whether I use the displayport or vga connections.
Laptop Panel + VGA = With both on, the picture is perfect and I can move
windows from one to the other.
NO Laptop Panel, Just VGA = I am able to disable the onboard laptop
screen and just have the external monitor, however the external display
is corrupted.
Displayport connectivity behaves as described previously mentioned, i.e.
still completely blank when attempting to disable laptop screen, but
fine if both are allowed to display.
I have also verified that the same behaviour is exhibited under Fedora
16 Alpha LiveCD. Will raise upstream and Fedora Bugs.
** Also affects: gnome-control-center (Fedora)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/828623
Title:
gnome control centre does not allow you to disable the laptop screen
while leaving an external connected screen working
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