Optimization of low power states while AC line power availability is limited

An information handling system, comprising:

• a port through which the information handling system is coupled to a power adapter;
• an internal battery;
• and
• an embedded controller having access to memory media storing instructions executable by the controller to:
• determine that a trigger condition for limiting electrical power drawn by the information handling system from the power adapter coupled to the information handling system is met;
• in response to determining that the trigger condition is met:
• limit the electrical power drawn from the power adapter by the information handling system to an amount less than or equal to the lesser of a power rating of the power adapter and a capacity of an AC line power source to which the power adapter is coupled to supply electrical power;
• throttle a computing load at the information handling system;
• and
• supplement the electrical power drawn from the power adapter by drawing, based on the throttled computing load and electrical power drawn from the power adapter, additional electrical power for execution of the computing load at the information handling system from an internal battery of the information handling system,
• wherein the computing load is throttled and an amount of the additional electrical power that is drawn from the internal battery such that a full charge level of the internal battery is maintained.