I had the same problem, but  managed to get s2ram to work with the following 
work-around:

I re-compiled the kernel, selecting module compilation for "Mouse
interface" and "AT keyboard" (I first removed "if EMBEDDED" from
drivers/Kconfig and drivers/keyboard/Kconfig).

I added a file  /usr/local/sbin/nap, containing

#/bin/bash
rmmod i8042
s2ram -f
modprobe i8042

and modified /etc/acpi/lid.sh to contain only

#!/bin/bash
grep -q closed /proc/acpi/button/lid/*/state
if [ $? = 0 ]
then
 /usr/local/sbin/nap
fi

This seems to work. Closing lid suspends, power button after opening lid
resumes.

 Klas

-- 
HP TC4400 Tablet PC suspend and hibernate problems
https://bugs.launchpad.net/bugs/102648
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