Centrino Performance States
I cannot seem to gain access to the processor "p-states" (performance States) of my Dell D600 (P-M 1.4).
I have compiled support for the p-states into the kernel but there is no /proc/acpi/processor/*/performance_ despite me having compiled it in.
I know a little bit about linux but all the info on the web is either WAAAY out of date or far above my level of competence.
Can anyone help? I want to get the battery life up to the 5 hrs I get in windows instead of a paltry 2.5 hrs
I found this on the ACPI4Linux website:
This file shows information about performance management:
This is the name ACPI invented for processor frequency and voltage scaling. It means that your processor can run on (at least) two different frequencies and voltage ranges. Best known is the Intel(C) SpeedStep(TM) Technology, which offers a "Maximum Performance Mode" and a "Battery Mode". When the system is set to the "Battery Mode", the system uses much less power, but there is a slight performance decrease, too, as the CPU frequency is decreased. In most cases this should be of almost no effect in "usability". Note that "performance states" are much more power-efficient than throttling and/or power management.
A note about kernel 2.6: Frequency scaling via this file is deprecated, see the files in /sys/devices/system/cpu/cpu0/cpufr_ eq/ instead.
The last line states that something similar should exist in the /sys section but it is not there.
Also (on prompting from another forum) this is a line for the dmesg output. The only on ethat related to cetrin and speedstep
speedstep-centrino: found "Intel(R) Pentium(R) M processor 1400MHz": max frequency: 1400000kHz
Also I have read about a kernel module for speedstep from Intel but cannot find it anywhere. Does it exist? Where can I find it?
Sorry for the lenght of the post and thanks to anyone who helps
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