Tried the latest kernel i could find, and the problem is gone.
$ uname -a
Linux pieters-laptop 2.6.38-020638rc4-generic #201102081010 SMP Tue Feb 8
10:12:40 UTC 2011 x86_64 GNU/Linux
** Changed in: linux (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/717919
Title:
ACPI + kworker high interrupts.
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