I encountered this problem recently.

Displayed Cpu usage values are over 1100% regularly, which, I persume, are 
slighly erroneous ;-)
Strange thing though is that my desktop system is not affected but my laptop 
definitely is.

Both are running Ubuntu Intrepid Ibex 8.10
only differences

info:
Desktop (P4 model 640/3.2GHz HT enabeled Intel 915P): backports enabled.
Laptop (Mobile P4/3.06GHz model 532 HT enabeled Intel 865PE) : "MP-BIOS BUG 
8254 timer not connected - use noapic option to boot" during boot. 
(tested with noacpi, makes no difference to the above "top" problem)

Both:
top: procps version 3.2.7
uname -a:  Linux 2.6.27-11-generic #1 SMP Thu Jan 15 11:03:58 UTC 2009 i686 
GNU/Linux



** Attachment added: "dmesg.log"
   http://launchpadlibrarian.net/21485588/dmesg.log

-- 
strange cpu usage in top, conky, etc. probably kernel related
https://bugs.launchpad.net/bugs/268755
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