saving laptop battery power without the need to delve deeper into technical details.
TLP’s default settings are already optimized for battery life, so you may install it and just sit back and relax. Nevertheless, TLP is completely customizable to get even more power savings or meet your exact requirements.
sudo pacman -S tlp tlpui cpupower
sudo systemctl enable tlp.service
I enabled the panel cpufreq plugin on my Thinkpad X220 and saw that AC/BAT power changes were handled correctly