Documentation of options and default values taken from the upstream UPower.conf. The documentation was modified slightly to make more sense when displayed on https://nixos.org/nixos/options.html. A copy of upstream UPower.conf can be found here: https://cgit.freedesktop.org/upower/tree/etc/UPower.conf?id=28bd86c181e2510ef6a1dc7cfa26f97803698a79
To build the manual, you need Nix installed on your system (no need
for NixOS). To install Nix, follow the instructions at
https://nixos.org/nix/download.html
When you have Nix on your system, in the root directory of the project
(i.e., `nixpkgs`), run:
nix-build nixos/release.nix -A manual.x86_64-linux
When this command successfully finishes, it will tell you where the
manual got generated.