Please try the Feisty daily build http://cdimage.ubuntu.com/daily- live/current. There is an ACPI fix that addresses your problem.
** Changed in: linux-source-2.6.20 (Ubuntu)
Importance: Undecided => Low
Assignee: Tim Gardner => Ubuntu Kernel ACPI Team
Status: Needs Info => Fix Released
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acpi_cpufreq no longer loaded automatically
https://launchpad.net/bugs/95849
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