I'd say powertop is almost useless today. It was designed in an era when individual devices were loosely-coupled, you could simply identify the power hogs one-b

I'd say powertop is almost useless today. It was designed in an era when individual devices were loosely-coupled, you could simply identify the power hogs one-by-one and fix them. Today, power management is tightly-coupled with many subtle interactions and dynamic behavior. The most-common failure mode today: something prevents the SoC from entering a deeper sleep mode - you can't fix it with powertop, better to start reverse engineering firmware and Windows drivers... :(