Thanks for replying Robb and Tom!
My failure symptom is exactly the one described in the bug description:
- both after suspend and hibernation
- syslog, messages and kernel.log in /var/log grow to 2Gb in size and more
- they have listed a recurrent error message which starts with "bad: scheduling 
from the idle thread! swapper tainted" and refers to iwlagn.
- program 'dd' then starts to intensively use the disk and the CPU (which 
should be a consequence of the huge size of the logs)

I did not know the problem was still present in 
linux-backports-modules-2.6.27-8, I'll try removing it. 
However why not patching the backports as well?
Furthermore, shuldn't be the backport drivers more recent than the kernel ones? 
And if not shouldn't be the kernel ones attributed a higher priority when 
choosing which to load on behalf of the higher version number?

-- 
kernel 2.6.27-7-generic bug BUG: scheduling while atomic: swapper/0/0x00000100
https://bugs.launchpad.net/bugs/286285
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