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Most laptops come with some software bundled that helps configure this. Dell does I know. So did Lenovo.

Hey -- I don't see another way to get in touch with you, so advance apologies for the comment spam. In a past comment you mentioned that you used to run the Ricochet modem wikispace and have a bunch of documentation/etc -- perhaps I can host them on the Internet Archive? Particularly interested in the Garage Gateway stuff, I've never seen the code and I have an otherwise working Ethernet Radio & pair of poletops I'd love to get properly running. Email's in my profile if you'd like to get in touch.

https://linrunner.de/tlp/settings/battery.html

This does require firmware support but it's pretty seamless in Plasma. It requires a root password which is slightly irritating. At one point I went through the PolicyKit contortions to allow normal users (me) to change it.