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# Power Management Capabilities

Constants you use to get and set the state of the device’s power management features.

## Topics

### Capabilities Registers

[`kPCIPMCPMESupportFromD0`](/documentation/PCIDriverKit/kPCIPMCPMESupportFromD0)

The full-power state of the device, in which the device is running and fully operational.

[`kPCIPMCPMESupportFromD1`](/documentation/PCIDriverKit/kPCIPMCPMESupportFromD1)

A low-power state of the device, in which the device is handling only configuration and message requests.

[`kPCIPMCPMESupportFromD2`](/documentation/PCIDriverKit/kPCIPMCPMESupportFromD2)

A low-power state of the device, in which the device is not in use.

[`kPCIPMCPMESupportFromD3Hot`](/documentation/PCIDriverKit/kPCIPMCPMESupportFromD3Hot)

A low-power state of the device, in which the device is running in a limited capacity.

[`kPCIPMCPMESupportFromD3Cold`](/documentation/PCIDriverKit/kPCIPMCPMESupportFromD3Cold)

The state where the device has no power.

[`kPCIPMCD1Support`](/documentation/PCIDriverKit/kPCIPMCD1Support)

A constant that indicates the device supports the D1 state.

[`kPCIPMCD2Support`](/documentation/PCIDriverKit/kPCIPMCD2Support)

A constant that indicates the device supports the D2 state.

[`kPCIPMCD3Support`](/documentation/PCIDriverKit/kPCIPMCD3Support)

A constant that indicates the device supports the D3 state.


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