Update:
Kernel 2.6.18-r4
I've done some more testing, and I've narrowed the problem down to the
"processor" cpu driver.
I disabled all power management features in the kernel, and compiled
ACPI as modules so that they would not be loaded until I wanted them to be.
APM is off.
CPU Frequency Scaling is off.
ACPI is compiled entirely as modules to be loaded by the user.
While running on the battery:
As soon as I "modprobe processor" the humming begins, and as soon as I
"rmmod processor" the humming stops.
While running on AC, if I "modprobe processor" there is no buzzing. I
can remove the AC adapter and the computer remains silent.
It seems to be something related to the way that the processor driver is
handling power to the CPU. Ideas?
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