I thought so. I would imagine that it's kernel related.
So far this workaround has worked here
http://souriguha.wordpress.com/2011/03/08/how-to-solve-problem-with-thinkpadkslowd-kworker-on-linux-kernel-2-35-2-36/

At least my T400 is usable now :)

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https://bugs.launchpad.net/bugs/779753

Title:
  T400 laptop. Freezes or mouse stutters. Kworker process using too much
  CPU.

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