# CPU power management

CPU power management techniques aim to reduce the power consumption of
the CPU during both active and idle periods by using the resources
efficiently.

For example, run the cores at the necessary frequency while keeping them
in a Low-Power state as much as possible.

You can use the following power optimization techniques and CPU
core sleep states to achieve optimized CPU power on
Qualcomm Linux.

- [Dynamic voltage and frequency scaling](https://docs.qualcomm.com/doc/80-70020-30/topic/dcvs.html)
Dynamic voltage and frequency scaling (DVFS) is a technique used to reduce power consumption of the CPU during active periods. This technique is used to switch the CPU core frequency based on load requirement. DVFS helps in balancing the power, performance, and thermal behavior of the device.
- [Efficient CPU idle power management](https://docs.qualcomm.com/doc/80-70020-30/topic/idlepowermanagement.html)
CPU idle power management, or idle power management, keeps
the CPU cores in the appropriate sleep state for efficient use of energy
when the device is idle.
- [Monitor Suspend Power Management](https://docs.qualcomm.com/doc/80-70020-30/topic/suspend-power-management-state.html)
The Suspend state is the deepest sleep state in the APSS with all user
space processes frozen and drivers releasing their resources. During the
Suspend state, all cores enter the C4 state followed by the AOSD Sleep
state.
- [Efficient wake up latency with power QoS APIs](https://docs.qualcomm.com/doc/80-70020-30/topic/pmqos.html)
The power management quality of service (PM QoS) API allows drivers to
specify the latency requirement (in microseconds).

Last Published: Jul 03, 2025

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