admin-guide/pm/strategies.rst

1 .. SPDX-License-Identifier: GPL-2.0
5 Power Management Strategies
13 The Linux kernel supports two major high-level power management strategies.
15 One of them is based on using global low-power states of the whole system in
17 significantly reduced, referred to as :doc:`sleep states <sleep-states>`.  The
23 :doc:`system-wide power management <system-wide>`.
25 The other strategy, referred to as the :doc:`working-state power management
26 <working-state>`, is based on adjusting the power states of individual hardware
30 a metastate covering a range of different power states of the system in which
32 ``inactive`` (idle).  If they are active, they have to be in power states
34 are inactive, ideally, they should be in low-power states in which they may not
38 "runtime active" and that situation typically corresponds to the maximum power
41 state from the physical system configuration and power draw perspective, but
49 Moreover, the two power management strategies address different usage scenarios.
54 use the working-state power management in case it becomes idle, because the user