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    SubjectRe: 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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