Messages in this thread | | | From | Pedro Ramalhais <> | Subject | Re: speedstep-centrino on dothan | Date | Wed, 06 Jul 2005 17:30:14 +0100 |
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st3@riseup.net 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. > > > -- > ciao > st3 >
I looked into it 2 weeks ago, and i couldn't find a complete voltage table for the Dothan C1 stepping (which my laptop has). I only found a table with (IIRC) the max and min voltages for the max and min frequencies. I also didn't understand the meaning of the different VID#{A,B,C,D,E} values. Are these voltages related to the quality of the power supply, or the quality of the processor? How do we know which one to choose?
Regards, -- Pedro Ramalhais
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