Re: HP nc6400 v.03 or v.05 laptop ACPI fails after reboot, works again after booting windows

Lincoln Baxter, III
2006-12-15T22:35:40Z

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?