I have exactly the same behaviour on my Thinkpad X31, fully updated
8.10.  For hardy, hibernate had always worked faultlessly.  The machine
does occasionally resume successfully.  On initial hibernate, I get a
thaw error of -16, the full messages disappears before I can write it
down but I'll capture it if it is important.
I have also edited the grub boot line on start-up to remove the "quiet" and 
"splash" words.
This is the console output I see (I may have made type errors):
...
PM: Starting manual resume from disk
Freezing user space processes ... (elapse 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapse 0.00 seconds) done.
PM: Loading image data pages (110237 pages) ... done
PM: Read 476948 kbytes in 27.20 seconds (17.53 MB/s)
Suspend console(s) (use no_console_suspend to debug)

The machine then freezes, flashing the caps lock light at about 1Hz.

I tried resuming from suspend with the no_console_suspend flag attached
to the boot line (is that what I was meant to try?) and each time the
machine resumed successfully.

-- 
Hibernate fails on Thinkpad T41
https://bugs.launchpad.net/bugs/282220
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