Abstract: In an embodiment, a mobile device is equipped with an application processor configured to execute a HLOS and a secondary processor(s) configured to control sensor(s) coupled to the mobile device. The mobile device monitors the sensor(s) while the mobile device is operating in a low power mode that is characterized by one or more cores of the application processor being in a power collapse state or dormant state. The mobile device identifies a user action based on the monitoring and communicates, while the mobile device continues to operate in the low power mode, with detected proximate device(s) over a local wireless communications interface to request that at least one device action changing a user interface output feature and/or a user environment feature be implemented at the detected proximate device(s).