Re: FSB scaling for ASUS EeePC 1000H

[Francesco Lattanzio <franz.lattanzio@gmail.com>]

Matthew Garrett ha scritto:
> On Sun, Mar 15, 2009 at 04:01:23PM +0100, Francesco Lattanzio wrote:
>   
>> The following patch (against the current "linux-acpi-2.6" source tree) 
>> adds the capability of the ASUS EeePC 1000H (and maybe other models as 
>> well) to scale the FSB frequency and core voltage. Do not confuse this 
>> with cpufreq (SpeedStep and other similar mechanisms): cpufreq changes 
>> the internal CPU clock multiplier (and eventually the core voltage too) 
>> leaving the FSB frequency untouched.
>>     
>
> No, there's no requirement that cpufreq be limited to clock-multiplier 
> based methods. It's the right interfae to use for CPU speed control.
>
> (snip patch)
>
> Is this different to the cpufreq driver suggested at 
> http://lkml.org/lkml/2008/11/23/115 , other than the latter having 
> hardcoded speed values?
>
>   
It is exactly the same thing, done differently. Now I ask you, should we 
put this feature inside some eeepc-specific cpufreq module, or inside 
the eeepc-laptop module? Keep in mind that the 1000H model allows me to 
combine the effects of both the cpufreq (through Atom SpeedStep feature) 
and these ACPI methods.

-- 
Francesco Lattanzio <franz.lattanzio@gmail.com>