Re: freqency scaling on compaq nx9010

[Thomas Eschenbacher <Thomas.Eschenbacher-Mmb7MZpHnFY@public.gmane.org>]

Dominik Brodowski wrote:
> [...]
>>I have a compaq nx9010 laptop, running on kernel 2.6.9-gentoo-r13, with 
>>ACPI enabled and speedstep for frequency scaling.
> 
> Which variant of speedstep?

The file "scaling_driver" told me it was "speedstep-smi".
(which makes no sense to me, I have an ALI and no Intel chipset...)
No idea what it really was, I saw no kernel message about
speedstep or so.
(ACPI version is 20040816)

> [...]
>>On the other hand my dsdt contains two entries in the _PSS section, one 
>>for 3059MHz (100%) and one for 1596MHz (~50%) - but those two 
>>frequencies appear nowhere in /proc or /sys/devices/... !?
> 
> What does using the acpi-cpufreq driver lead to?

...to success :-)   Great, this was the right hint!

I kicked out all speedstep stuff from my kernel config and now I see 
30590000 and 15960000 in 
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies -
the same values as in my DSDT, using acpi-cpufreq as driver.

So what would be the advantage of speedstep over acpi-cpufreq ?
Does it also switch core voltage or do other things?

thanks for the quick reply and the help,
    Thomas


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