I have an Intel HD3000 integrated gpu on my laptop (cpu is i3 sandy bridge ULV). I have a problem when I connect my external monitor, both with VGA and HDMI output. Honestly I'm not sure that it's an hardware problem, because the following screen is explicative: http://www.abload.de/img/2012-12-09-1355073813jmaac.png
-laptop monitor resolution is 1366x768
-external monitor resolution is 1920x1200
-screen (taken with scrot) is a 1920x1200 image, and is what I see on my external monitor
So the external monitor is using its native resolution, but in a crazy way: the original 1366x768 desktop "replicated" in order to fill the remaining space.
I have no idea how to fix this.
I have no more a xorg.conf to hack, maybe should I create a specific xx-intel.conf