I have not paid a little effort on power-saving setting of my laptop machine, but I finally made it to some extent. After searching around the web pages, the article on the https://forums.bunsenlabs.org/viewtopic.php?id=1920 page reminded me of laptop-mode-tool package and tried it. At first, I installed laptop-mode-tool, rebooted and launched the powertop . The following screen capture is its screen: PowerTOP 2.6.1 Overview Idle stats Frequency stats Device stats Tunab >> Bad Wireless Power Saving for interface wlan0 Bad Enable Audio codec power management Bad Enable SATA link powe...