Same issue for me, Kubuntu 8.04 on a HP nx8220.  I suffer from thermal
shutdowns due to heavy cpu loads. On several occasions (while running
cpu intensive apps) I also have nearly 90% cpu load from kacpid and
acpid_notify (there is another bug report elsewhere).

My cpu temperature is NOT updated (acpi displays constant 16 C, which is
of course ridiculous), and the fan is not spinning when cpu temp rises.
The problem appeared suddenly, I never had any issues with Hardy.
Booting into the Intrepid live cd made no difference.  However, the
problem disappears when I boot with acpi=off.  Hence, some acpi or
kernel bug makes ubuntu with acpi unusable, at least for me.

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thinkpad CPU overheat ubuntu hardy 8.04 
https://bugs.launchpad.net/bugs/213818
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