powersaved(8) on Linux
The text 13c46b25c85e, as Debian 4.0 (Etch) shipped it.
supports APM and ACPI: three battery states, proper standby/suspend, cpu frequency scaling and other power management tasks
Flags it lists
-
-c -
-d -
-f -
-h -
-n -
-r -
-s -
-v -
-x -
-y