Cpu is "constant" on high frequency

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You can make an udev rule to automate the change of governor based on battery or on charger:

Make the following file:
sudo nano /etc/udev/rules.d/99-ac-battery.rules

With the content:

## ACTION TO DO WHEN ON BATTERY
SUBSYSTEM=="power_supply", ACTION=="change", ENV{POWER_SUPPLY_ONLINE}=="0", ENV{POWER}="off", RUN+="/usr/bin/cpupower frequency-set --governor ondemand"

## ACTION TO DO WHEN ON CHARGER
SUBSYSTEM=="power_supply", ACTION=="change", ENV{POWER_SUPPLY_ONLINE}=="1", ENV{POWER}="on", RUN+="/usr/bin/cpupower frequency-set --governor performance"

Then execute sudo udevadm control --reload-rules

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