I can confirm this bug on a Thinkpad T400 (fresh Intrepid system). The
symptoms are exactly as described above.

Enabling the proposed-updates repository did NOT fix the bug for me! The 
symptoms stay the same. I can resume from suspend when I deactivate all but one 
core before suspend, however the system freezes as soon as I enable the second 
core again.
(If I do the enabling on a console, the system does not hang until I switch 
back to X)

ha...@sputnik2:/etc/pm/sleep.d$ uname -a
Linux sputnik2 2.6.27-11-generic #1 SMP Thu Jan 15 11:42:36 UTC 2009 x86_64 
GNU/Linux

Also tried the updated graphics driver mentioned above.
(II) Loading /usr/lib/xorg/modules/drivers//intel_drv.so
(II) Module intel: vendor="X.Org Foundation"
        compiled for 1.5.2, module version = 2.5.1
        Module class: X.Org Video Driver
        ABI class: X.Org Video Driver, version 4.1

-- 
Resume from suspend doesn't work on the Mobile 4 Series chipsets
https://bugs.launchpad.net/bugs/276943
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