After a week of testing, it appears that regressing to 2.6.20-15-generic
kernel did help, but the problem still occurs from time to time on my
Kubuntu Feisty system.

Using an alternate suspend2 patched kernel (available at:
http://3v1n0.tuxfamily.org/dists/feisty/suspend2/index.html) appears to
completely fix the problem.  It has also fixed this bug:
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/86820

My experience lead me to believe that Feisty kernels are problematic for
suspend/hibernation when compared to Dapper and Edgy ones...

-- 
System goes back into standby after it resumed
https://bugs.launchpad.net/bugs/119696
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