this post was submitted on 28 Mar 2024
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The new meta is Power Profiles Deamon: https://gitlab.freedesktop.org/upower/power-profiles-daemon/-/blob/main/README.md
Otherwise you should see if power management is enabled for all your pcie and input devices (using powertop for example). If you run a nvme ssd, make sure it is allowed to use all power states (bit more involved topic).
Good luck :D
Actually, the new new meta is TuneD, apparently you get better better battery life compared to PPD.
Fedora is considering switching to it, and some distros like Bazzite have already made the switch.