Re: speedstep-centrino on dothan

[Bill Davidsen]

st3@xxxxxxxxxx wrote:
> Currently, the speedstep-centrino support has built-in frequency/voltage
> pairs only for Banias CPUs. For Dothan CPUs, these tables are read from
> BIOS ACPI.
>
> But ACPI encoding may not be available or not reliable, so why shouldn't we
> provide built-in tables for Dothan CPUs, too? Intel has released this
> datasheet:
>
> http://www.intel.com/design/mobile/datashts/302189.htm
>
> with frequency/voltage pairs for every version of Dothan CPUs.
>
> Moreover, I checked on Pentium M 725 and Pentium M 715 that the lowest
> frequency at which the CPU can be set safely is not the 600MHz given in
> datasheets, but 400MHz instead, with VID#A, VID#B, VID#C and VID#D (see
> datasheet for more details) set to 0.908V.
>
> I can provide a patch, let me know.

Slower is better, and not depending on ACPI for anything which can be 
gotten elsewhere is a good thing. Sounds like a good idea to me.

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