FreeBSD & SpeedStep

[Drew Broadley]

Eduardo Mínguez Pérez wrote:

>Hi!
>This is my first mail to the list and I want to sorry for my english
>(I'm spanish ;D)
>My question is... Is speedstep supported by FreeBSD? My notebook is a p4
>mobile (1,7 Ghz)
>I'm using cpydyn or cpufreq under linux... and it works fine. It speed
>up or down my cpu frequency if needed.
>I've read something in 5.2.1 with acpi... but I don't know if it's like
>linux. Any idea?
>Thanks a lot ;)
>
>  
>
# sysctl hw.acpi  | grep cpu
hw.acpi.cpu.throttle_max: 8
hw.acpi.cpu.throttle_state: 8
hw.acpi.cpu.cx_supported: C1/1 C2/2 C3/185
hw.acpi.cpu.cx_lowest: C1
hw.acpi.cpu.cx_usage: 99% 0% 0%

When unplugging the AC to and from my laptop I get the following in dmesg:

cpu0: Performance states changed
cpu0: Performance states changed

Hopefully that answers your question :)

- Drew