Upon further testing, it seems like the likely cause for this is 2.6.21+
having BETTER power management support - and, thus, entering the lower
C-states. I did test disabling tickless operation, and it made the
issue worse. I decided to close this because the issue also exists in
Mac OS X and the lack of a problem in 2.6.18 seems like an aberration.
** Changed in: linux-source-2.6.22 (Ubuntu)
Status: New => Invalid
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MacBook makes whining noise when uhci-hcd loaded
https://bugs.launchpad.net/bugs/124642
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