Here 3 entries in /var/log messages which indicate that there are
missing resume-scripts in Lucid:

kernel: [  145.693980] snd-usb-audio 1-9:1.2: no reset_resume for driver 
snd-usb-audio?
kernel: [  145.693982] snd-usb-audio 1-9:1.3: no reset_resume for driver 
snd-usb-audio?
...
kernel: [  146.895035] usblp 2-3:1.0: no reset_resume for driver usblp?

So maybe those devices do not get proper initialized on resume, thus second 
suspend fails?
I have tried to blacklist the modules 'usblp' and 'snd-usb-audio', however that 
does not work.

-- 
[Lucid] kernel suspend + resume works only once, 2nd timesystem freezes
https://bugs.launchpad.net/bugs/592780
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