使用cpufreq降低CPU功耗
##安装
sudo apt-get install cpufrequtils
##查看当前CPU状态
cpufreq-info
设置参数
-d minimum frequency,
-u maximum frequency,
-f specific frequency (userspace governor must be set first) and
-g governor (ondemand conservative userspace powersave powersave)
-c specific CPU.
##设置为ondemand
sudo cpufreq-set -g conservative
##如果想手动修改请安装插件
sudo apt-get install indicator-cpufreq