Yes, it often does in a broad sense. But there is a lot more to power management. Things like putting busses and devices into low power states when idle, and

Yes, it often does in a broad sense. But there is a lot more to power management. Things like putting busses and devices into low power states when idle, and batching up I/O so that devices can spend most of their time in low-power states. Scheduler tweaks to idle most of the cores, etc.