Powersave

modulename: governor_powersave.ko

configname: CONFIG_DEVFREQ_GOV_POWERSAVE

Linux Kernel Configuration
└─>Device Drivers
└─>Generic Dynamic Voltage and Frequency Scaling (DVFS) support
└─>Powersave
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Sets the frequency at the minimum available frequency.
This governor always returns 0 as frequency so that
the DEVFREQ framework returns the lowest frequency available
at any time.

source code: