I have the same problem with my Lenovo W500 after an upgrade from 10.04
to 10.10.  pm-suspend hangs leaving the sleep LED blinking forever.  But
acpitool -s seems to suspend correctly.  I worked around this for now by
replacing the pm_suspend link in /usr/sbin with a script that invokes
acpitool.

su
apt-get install acpitool
mv /usr/sbin/pm-suspend /usr/sbin/pm-suspend.orig
echo /usr/bin/acpitool -s > /usr/sbin/pm-suspend
chmod ugo+rx /usr/sbin/pm-suspend

-- 
Ubuntu does not suspend for Lenovo Thinkpad T500
https://bugs.launchpad.net/bugs/659668
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