[ltp] SpeedStep? - ACPI "throttling"

[Satish Balay]

On Tue, 13 Apr 2004, Tony Whitmore wrote:

> Jordi G. March wrote:
> > Greetings,
> > 
> > I've got an A31p with a 1.8Ghz Mobile P4. When I suspend/resume, core 
> > frequency varies from 1.2Ghz to 1.8Ghz without, apparently, any reason. 
> > It's not a throttling problem because it resumes/starts with a "steady" 
> > frequency (say 1.2Ghz or 1.8Ghz), so /proc/acpi/processor/CPU/throttling 
> > always toggles according to that base (1.2Ghz or 1.8Ghz). 
> > 
> > What I want to do is to adjust to 1.8Ghz in case I resume with a 1.2Ghz 
> > "base", and I cannot achieve this by tuning /proc/.../throttling.
> > 
> > I've got a 2.4.24 kernel with ACPI + swsusp2 patches... I cannot go 
> > through 2.6.x right now, and test (maybe?) SpeedStep functions as I 
> > haven't been able to get swsusp2 working on 2.6 series.
> 
> Hi,
> 
> I noticed that my R40 would "step" based on whether or not the mains 
> lead was plugged in on power on. So if it was not plugged in, it would 
> run at 800MHz. If the mains was on when the laptop was powered on, it 
> would run at the full 1.4GHz.
> 
> I never got frequency scaling working under 2.4, I'm not even sure if 
> it's possible. It was very easy to get working with 2.6 though.

It works with FC1 kernel - which is 2.4 (however patched it is).

Satish