An array of object paths for devices. Enumerate all power objects on the system. Object path of device that was added. Emitted when a device is added. Object path of device that was removed. Emitted when a device is removed. Object path of device that was changed. Emitted when a device changed. Suspends the computer into a low power state. System state is not preserved if the power is lost. Hibernates the computer into a low power state. System state is preserved if the power is lost.