Thank you very much. After executing the command in the terminal, the system runs just as fast without power as it does on power. Previously on a clean Arch system I did not observe such anomalies. Out of pure curiosity I will reinstall the system to Garuda Barebones KDE and check how the battery will behave without mains power (unless power saving in Garuda Linux is enabled by default). I don't know how it is with a pure Arch system (it will be tested as another - installed from a script: GitHub - MatMoul/archfi: Arch Linux Fast Installer : tutorial installer, GitHub - MatMoul/archdi: Arch Linux Desktop Installer : tutorial installer) - Arch Linux Desktop Install download | SourceForge.net,