CPU Performance Management

Hi,

I have a Toshiba 2415-s205 with a P4M-2.0GHz and have recently been toying with ACPI support in the linux kernel. So far, I have gotten two versions running: The 2.5.66 kernel with the 20030328 ACPI patch and the 2.4.20 kernel with the 20021222 ACPI patch. Neither of the kernels have any other patches applied.

I am happy to see that (with a quick look) many features work well, except for an issue with the 20030328 patch. When I cat /proc/acpi/processor/CPU0/info I get the following output:

processor id:                      0
acpi id:                              1
bus mastering control:        yes
power management:           yes
throttling control:                no
performance management:  no
limit interface:                    no

Knowing that I have a P4M, I would have expected to have the option of performance management. Indeed, on the 20021212 patch on a 2.4.20 kernel, I have both performance management and limit interface enabled. Anyone have any clue what changed to actually disable performance management?

I've tried disassembling and recompiling my DSDT (using iasl 20030228); It gives me three identical warnings:

Package (0x00) {},
^ Effective AML package length is zero

Could this be my problem?

Any help would be greatly appreciated.

Ryan May