Enhanced SpeedStep driver available

Maxim Sobolev sobomax at portaone.com
Tue Aug 17 06:57:32 PDT 2004

Colin Percival wrote:

> At 11:08 16/08/2004, Maxim Sobolev wrote:
>>Colin Percival wrote:
>>> Thanks to everyone who has been sending me data about their
>>>processors (and in particular, the 90nm versions), I now have
>>>a first draft of a Enhanced SpeedStep driver available. [...]
>>It would be nice if you can extend it to use whatever speed control method is available (e.g. ACPI, TCC, ESS etc), so that it can be used on older machines as well.
> njl is working on a general cpufreq framework, and I'm sure he'll
> commit it as soon as it's ready; given that my knowledge of ACPI
> is absolutely nil, I think it's best if I leave that to him. :-)
> My Enhanced SpeedStep code is simply a temporary solution for a
> relatively simple case until cpufreq is ready.

Well, TCC is not that different from ESS. The only difference is that it 
operates with percentages, not with absolute frequences and that there 
are fewer steps available. Therefore, it should be fairly easy to add 
support for TCC as well.


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