On Thu, 5 Jul 2007, Tobias Nygren wrote:
> So I noticed the performance of my spare laptop (Thinkpad T22) has been
> poor recently (after acpi became the default maybe?). After doing
> sysctl -w machdep.speedstep_state=1 the performance is much better. Why
> does this sysctl default to 0, which I presume is the battery optimized
> mode? I think it should be changed to 1 by default for the sake
> of preserving pre-acpi behaviour.

The default value is the value as configured by the firmware at power-on 
time. Eg, if you boot the laptop with the AC adapter unplugged, the 
firmware may configure the state to "low", and when plugged in, "high". 
This is the behaviour I saw on an older Sony VAIO laptop.

Does this make any sense?

Cheers,
Jared