# CPU power management

Source: [https://docs.qualcomm.com/doc/80-70015-30/topic/cpupowermanagement.html](https://docs.qualcomm.com/doc/80-70015-30/topic/cpupowermanagement.html)

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

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

This guide provides information on power optimization techniques and CPU core sleep
            states that are used to achieve optimized CPU power on Qualcomm Linux.

- **[Dynamic voltage and frequency scaling](https://docs.qualcomm.com/doc/80-70015-30/topic/dcvs.html)**  

Dynamic voltage and frequency scaling (DVFS) management is a technique used to switch         the CPU core frequency based on load requirement. This technique helps to balance the power,         performance, and thermal behavior of the device.
- **[Idle power management](https://docs.qualcomm.com/doc/80-70015-30/topic/idlepowermanagement.html)**  

Idle power management, also known as CPU idle power management, keeps the CPU cores         in the appropriate sleep state for efficient use of energy when the device is idle.
- **[Suspend Power Management state](https://docs.qualcomm.com/doc/80-70015-30/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.
- **[Power management QoS APIs](https://docs.qualcomm.com/doc/80-70015-30/topic/pmqos.html)**  

The power management quality of service (PM QoS) API allows drivers to specify the         latency requirement (in microseconds). If the wake-up latency of a CPU core sleep state is         longer than the specified QoS latency, then the CPU core does not enter the respective sleep         state.

**Parent Topic:** [Power states and features](https://docs.qualcomm.com/doc/80-70015-30/topic/powerfeatures.html)

Last Published: Oct 16, 2024

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