Re: freqency scaling on compaq nx9010

[Dominik Brodowski <linux-X3ehHDuj6sIIGcDfoQAp7BvVK+yQ3ZXh@public.gmane.org>]

On Sun, Jan 09, 2005 at 09:33:08PM -0300, Thomas Eschenbacher wrote:
> 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)

Then you used the wrong speedstep-driver, AFAICS. It is only meant for
mobile Pentium III CPUs... I need to check why it didn't fail to load.

> 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?

The acpi-cpufreq driver (normally) also scales voltage, it may just be
slower than speedstep-ich or speedstep-centrino. However, it's ot faster or
slower than speedstep-smi.

	Dominik


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