[ACPI] CPU Performance Management

[Ryan M. <rm...@ou...>]

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