VIA C7 Enhanced PowerSaver (DANGEROUS)

modulename: e_powersaver.ko

configname: CONFIG_X86_E_POWERSAVER

Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU Frequency scaling
└─>VIA C7 Enhanced PowerSaver (DANGEROUS)
In linux kernel since version 2.6.21 (release Date: 2007-04-25)  
This adds the CPUFreq driver for VIA C7 processors. However, this driver
does not have any safeguards to prevent operating the CPU out of spec
and is thus considered dangerous. Please use the regular ACPI cpufreq
driver, enabled by CONFIG_X86_ACPI_CPUFREQ.

If in doubt, say N.

source code: