I have the same problems with a Thinkpad T61 and the same graphics adapter. My 
screen is a Samsung SyncMaster 243T. When connected on the dvi port of the 
dock, I get the signal out of range message as soon as gdm should appear. I can 
login blindly and get to gnome, but that's not too elegant.
After fiddling around with xorg.conf I connected an analog cable to the monitor 
to watch, if there may be something going on while the dvi signal is out of 
range. So I plug in the vga cable and at next boot I get a full resolution gdm 
over the dvi cable! I didn't set up the vga connection as second monitor or 
something like this, I simply plugged in the vga cable.
With both cables connected, everything works fine.

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gdm refuses to display on external monitor
https://bugs.launchpad.net/bugs/148189
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