linux-kernel - Re: speedstep-centrino (no such device)

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Message-ID: <46870BB7.9020901@mandic.com.br>
Date:	Sat, 30 Jun 2007 23:04:39 -0300
From:	"Renato S. Yamane" <renatoyamane@...dic.com.br>
To:	Robert Hancock <hancockr@...w.ca>
CC:	cpufreq@...ts.linux.org.uk,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	jeremy@...p.org
Subject: Re: speedstep-centrino (no such device)

Robert Hancock wrote:
> Renato S. Yamane wrote:
>> Is impossible use speedstep in my Laptop with Pentium M 1,86Ghz:
>>
>> #modprobe speedstep-centrino
>> FATAL: Error inserting speedstep_centrino 
>> (/lib/modules/2.6.18-3-686/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko): 
>> No such device
>>
>> To do that (speedstep), I need install powersaved, but 
>> speedstep-centrino is not used.
> 
> I believe acpi-cpufreq is preferred over speedstep-centrino in most 
> cases today, does that work?

Robert, acpi_cpufreq works fine to me.
I insert parameter CPUFREQD_MODULE="acpi_cpufreq" in my 
/etc/powersave/cpufreq and now is possible use scaling frequency.

I read 
/usr/src/linux-2.6.21.5/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c 
and see that this module is made using document 25261202.pdf (from 
Intel) as reference.

This document include only some Pentium M models.

My Pentium M is model 750 (1.86GHz) and you can see datasheet on 
document 30526202.pdf available here:
<http://download.intel.com/design/mobile/datashts/30526202.pdf>

What I can choose on "CPUFreq Processor drivers" availiable in .config?
Currently I do that (in Kernel 2.6.21.1):

# CPUFreq processor drivers
#
CONFIG_X86_ACPI_CPUFREQ=m
# CONFIG_X86_POWERNOW_K6 is not set
# CONFIG_X86_POWERNOW_K7 is not set
# CONFIG_X86_POWERNOW_K8 is not set
# CONFIG_X86_GX_SUSPMOD is not set
CONFIG_X86_SPEEDSTEP_CENTRINO=y
CONFIG_X86_SPEEDSTEP_CENTRINO_TABLE=y
CONFIG_X86_SPEEDSTEP_ICH=m
# CONFIG_X86_SPEEDSTEP_SMI is not set
# CONFIG_X86_P4_CLOCKMOD is not set
# CONFIG_X86_CPUFREQ_NFORCE2 is not set
# CONFIG_X86_LONGRUN is not set
# CONFIG_X86_LONGHAUL is not set
# CONFIG_X86_E_POWERSAVER is not set

#
# shared options
#
# CONFIG_X86_ACPI_CPUFREQ_PROC_INTF is not set
CONFIG_X86_SPEEDSTEP_LIB=m
CONFIG_X86_SPEEDSTEP_RELAXED_CAP_CHECK=y

Best regards,
Renato S. Yamane
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