Comment 30 for bug 394490

test of xserver-xrg-core:
intel driver back to 20090709

xserver-xorg-core reverted to:
xserver-xorg-core_2%3a1.6.1.902~git20090629+server-1.6-branch.5b49aff4-0ubuntu0sarvatt~jaunty_i386.deb
bug still present

xserver-xorg-core reverted to:
xserver-xorg-core_2%3a1.6.1.901+git20090523+server-1.6-branch.5cd5a012-0ubuntu0sarvatt5_i386.deb

working
$ xrandr --verbose --output LVDS1 --autocrtc 1: 1024x768 60.0 +0+768 "LVDS1"

I don't have any package in-between.
But i would say you found the problem :)