1. A sensor controller comprising: a sensor controller processor to gather contextual data from a sensor; and a computer-readable medium that stores instruction thereon that, when executed by the sensor controller processor, direct the sensor controller processor to: receive power-management data comprising an operational state of a device communicatively coupled to the sensor controller, the power management data to be received from a sideband signal; format the contextual data to remove vendor specific indicators; and modify the operational state of the device based on the formatted contextual data and the power-management data, the formatted contextual data comprising a proximity of the device to a user, wherein the operational state comprises a power off state to describe when a main processor is completely powered off and cannot be awakened by the sensor controller, and wherein the sensor controller processor is to modify the operation of the sensor controller based on the power-management data by powering down the sensor when the main processor of the device is in the power off state.