This seems to be fixed in current Gutsy. The problem with Clone mode is
still there but this could be fixed through adding something like that
to /etc/gdm/Init/Default:
#disable lfp if external monitor is connected
if xrandr | grep -q "VGA connected"
then
xrandr --output LVDS --off
fi
Compiz works but it is very slow on 1680x1050 screen. Maybe it is fault
of the weak i915 chip.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Fix Released
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[gutsy] animations and video watching aren't possible with an external monitor
on an Intel laptop
https://bugs.launchpad.net/bugs/129025
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