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I think I had the same problem on a Dell Latitude E4300 (Core 2/P9300)
and the interesting thing was that the overload happened mostly when the
laptop was being charged and when I removed the AC adapter to run on
battery, after some minutes, the laptop was responsible again. In my
case, when this bug happened, the whole laptop was not flawless any
more, very slow and high CPU load. There is an other problem that the
laptop shits on the cpu scaling policy and decides about the current
speed without any sane reasons. If this bug happened and the cpu scaling
dropped the frequency to 800 Mhz, the laptop was quite useless when it
was being charged.

I think I experienced the bug under Maverick first and the upgrade to
Natty did not help. Now I upgraded to the latest unofficial natty
kernel: http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.39-rc4-natty/
and the intel graphics driver from this PPA:
https://launchpad.net/~glasen/+archive/intel-driver and after one day of
use, the problems seem to be solved expect the cpu scaling crazyness,
but I do not have too much hope that a linux will ever work on this
laptop without problems.

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https://bugs.launchpad.net/bugs/524281

Title:
  Tens of wakes per second in "[kernel scheduler] Load balancing tick"
  on Core 2 Duo even with only 1 core enabled