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  cpufreqd.service                                                                                      loaded active running   LSB: start and stop cpufreqd
  cpufrequtils.service                                                                                  loaded active exited    LSB: set CPUFreq kernel parameters
  loadcpufreq.service                                                                                   loaded active exited    LSB: Load kernel modules needed to enable cpufreq scaling
/etc/init.d/cpufreqd
/etc/init.d/cpufrequtils
/etc/init.d/loadcpufreq

cpufreqd

Fully configurable daemon for dynamic frequency and voltage scaling 

/etc/cpufreqd.conf
/etc/default/cpufreqd

cpufrequtils

It provides: 

/etc/init.d/cpufrequtils
/etc/init.d/loadcpufreq
cpufreq-set
cpufreq-info
cpufreq-aperf

utilities to deal with the cpufreq Linux kernel feature This package contains two utilities for inspecting and setting the CPU frequency through both the sysfs and procfs CPUFreq kernel interfaces. . By default, it also enables CPUFreq at boot time if the correct CPU driver is found. 

/etc/default/cpufrequtils