The last point of the symptoms section ("moving the cursor out of the
internal LVDS screen makes it appear on the external  screen") surprises
me a bit:

in earlier releases of ubuntu, the maximum desktop size is limited, read
I was not able to combine the internal LVDS (1024x768) with my external
display that has a much larger resolution of 1920x1200. This new
behavior however shows that the mouse coursor can reach both screens
independently.

The other interesting observation is that a simple query auto enables
the external screen in a "extended desktop" configuration. Is this
behavior intended or a (possibly related) defect?

-- 
[i945] querying information on external monitor with xrandr hangs gpu
https://bugs.launchpad.net/bugs/503255
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