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Machine is:
Kubuntu 9.04 (with KDE 4.2.96 - but this shouldn't matter here)
xserver-xorg-video-intel  2:2.6.3-0ubuntu9.3
Integrated Graphics Chipset: Intel(R) Mobile Intel® GM45 Express Chipset
Notebook LVDS is 1280x800
External panel used at 1024x768

I'm trying to configure X for a dual-view wide desktop.
Using a minimal xorg.conf and playing with xrandr I found the
following reproducable limitation

this works:
  xrandr --output VGA --mode 1024x768 --pos 0x0 --output LVDS --mode 1280x800 --pos 770x0
this causes an xorg crash:
  xrandr --output VGA --mode 1024x768 --pos 0x0 --output LVDS --mode 1280x800 --pos 771x0

So the largest working desktop has an effective extent of 2050x800.
I saw something about a 2048 virtual limitation
  https://bugs.freedesktop.org/show_bug.cgi?id=10299#c18
Not sure if there's a connection.

Bottom line: on this machine dual head only works with cloning.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
crash on intel GM45 with screen offset > 770
https://bugs.edge.launchpad.net/bugs/401164
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