Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)

modulename: speedstep-smi.ko

configname: CONFIG_X86_SPEEDSTEP_SMI

Linux Kernel Configuration
└─>CPU Frequency scaling
└─>Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)
In linux kernel since version 2.6.12  
This adds the CPUFreq driver for certain mobile Intel Pentium III
(Coppermine), all mobile Intel Pentium III-M (Tualatin)
on systems which have an Intel 440BX/ZX/MX southbridge.

For details, take a look at Documentation/cpu-freq/.

If in doubt, say N.

source code:
selects
CONFIG_CPU_FREQ_TABLE

depends
CONFIG_CPU_FREQ
CONFIG_EXPERIMENTAL
CONFIG_X86_32