set_system_power_state
err = set_system_power_state(APM_STATE_SUSPEND);
err = set_system_power_state(APM_STATE_STANDBY);
set_system_power_state(APM_STATE_REJECT);
set_system_power_state(APM_STATE_REJECT);
err = set_system_power_state(APM_STATE_BUSY);
(void)set_system_power_state(APM_STATE_OFF);