My laptop (Lenovo Thinkpad T60) also suffers from this problem.  I am
running Gutsy and installed the 64-bit Hardy -rt kernel (2.6.24-16-rt).
The Gutsy kernel works just fine for suspend resume for me.  It seems
that the Hardy -rt kernel has no problems suspending (all the fans go
off, the suspended light comes on, backlight goes off, etc.  It only
seems to have problems on resume.  The suspend light blinks off, the
drives and fans spin up and the backlight comes on (with a blank
screen).  At this point, it just sits there apparently idle, yet not
resumed.  The keyboard does seem to have some effect -- caplock and
numlock both make the appropriate lights light up on the keyboard.  And
sysrq keys work (well, at least sysrq+b reboots the computer).

I tried to capture some more output by connecting up to another machine
and using a serial console.  But I guess suspending does not write to
the main console so that didn't capture any output.  But it did seem to
allow the computer to successfully suspend several times.  Oddly enough,
after booting without the serial console, it was back to hanging on
resume again.

The attachment contains the appropriate sections of /var/log/messages
from a boot to suspend for a failed resume and the entire
boot/suspend/resume cycle from a successful one.  It also contains lspci
-vvnn output.

** Attachment added: "tarball containing successful and failing messages and 
lspci -vvnn output"
   http://launchpadlibrarian.net/13567658/thinkpad-t60-logs.tar.gz

-- 
linux-rt freezes on suspend
https://bugs.launchpad.net/bugs/195018
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