Various embodiments are directed to restrictions in portable computing device electric power to accommodate reductions in the voltage level of a power source. An apparatus comprises a controller caused to receive configuration data from a main processor circuit specifying a voltage level threshold and selected action to take to reduce electric power to a first component in response to the voltage level falling below the first voltage level threshold, recurringly monitor the voltage level; based on the voltage level falling below the first voltage level threshold, take the first selected action and transmit a signal to the main processor circuit indicating that the voltage level has fallen below the first voltage level threshold and that the first selected action has been taken; transmit the voltage level to the main processor circuit; receive a signal from the main processor circuit to undo the first selected action; and so undo.