Power management kinda doesn't work on Linux, outside of ACPI. There are very minimal rules once you disconnect from AC, and most of the time you'll switch into

Power management kinda doesn't work on Linux, outside of ACPI. There are very minimal rules once you disconnect from AC, and most of the time you'll switch into high-usage mode when it isn't needed. There's not a clean way to fix this, to my knowledge; the Linux scheduler stack is just kinda based around desktop and server hardware. That being said, I also use Linux on my Thinkpad anyways. There are decent enough workarounds that I can keep my system up for 5-6 hours when away from AC: - Switching into battery-saver mode will keep clock speeds down, which generally reduces power usage (as long as you aren't slamming the cores) - tlp can help if your hardware has power-draining characteristics (I don't use it, my defaults are good enough) - Using an auto-nicer can keep your system feeling responsive in low-resource environments: https://github.com/pop-os/system76-scheduler https://github.com/pop-os/system76-scheduler So... caveat emptor, YMMV. Linux is far from the most efficient OS away from the wall, but with a little bit of configuration I feel like my system does indeed work as a "normal laptop".