This happens for me too on my Lenovo Thinkpad R61 (with an i965 though).
With a second monitor just connected, the resolution of the gdm login
screen on the internal screen is 1024x768, rather than 1280x800 as it
should be (the external monitor I have connected is not widescreen, but
it does go up and to and beyond 1280x1024.
This is with the latest updates for Intrepid and a completely standard
basic xorg.conf (from running sudo dpkg-reconfigure -phigh xserver-xorg)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 0c)
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Confirmed
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[Intrepid] Regression: wrong GDM resolution when using external display on i945
https://bugs.launchpad.net/bugs/281486
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