VIA C7 Enhanced PowerSaver

modulename: e_powersaver.ko

configname: CONFIG_X86_E_POWERSAVER

Linux Kernel Configuration
└─>CPU Frequency scaling
└─>VIA C7 Enhanced PowerSaver
In linux kernel since version 2.6.21 (release Date: 2007-04-25)  
This adds the CPUFreq driver for VIA C7 processors.

If in doubt, say N.

source code:
arch/x86/kernel/cpu/cpufreq/e_powersaver.c
selects
CONFIG_CPU_FREQ_TABLE

depends
CONFIG_CPU_FREQ
CONFIG_X86_32 or CONFIG_EXPERIMENTAL or CONFIG_ACPI_PROCESSOR