C-States configuration

[hiren panchasara]

I am running -current on my T420 at r263906M

debug.acpi.acpi_ca_version: 20130823

o/p of sysctl -a | grep acpi - http://bpaste.net/show/199806/

 and I have following in my rc.conf:

performance_cx_lowest="Cmax"
economy_cx_lowest="Cmax"

But I still get:

% sysctl -a | grep cx_lowest
hw.acpi.cpu.cx_lowest: C1
dev.cpu.0.cx_lowest: C1
dev.cpu.1.cx_lowest: C1
dev.cpu.2.cx_lowest: C1
dev.cpu.3.cx_lowest: C1

And I can do:
# sysctl dev.cpu.0.cx_lowest=Cmax
dev.cpu.0.cx_lowest: C1 -> C8

that tells me that Cmax is C8.

% sysctl -d dev.cpu.0.cx_lowest
dev.cpu.0.cx_lowest: lowest Cx sleep state to use

I was expecting cx_lowest to be set to C8 because of rc.conf config I have.

What am I missing here?

cheers,
Hiren