====== PowerTop ======
  * https://github.com/fenrus75/powertop
  * https://access.redhat.com/documentation/ko-kr/red_hat_enterprise_linux/6/html/power_management_guide/powertop
  * https://wiki.archlinux.org/index.php/Powertop
  * https://idchowto.com/?p=32077
  * [[https://gist.github.com/isgroup-srl/1b6bcd6419db575efb30f4bc2096642a|Dell XPS 13 (9370) 2018]]