Methods, apparatus, systems, and articles of manufacture to perform platform agnostic control of a display using a hardware agent are disclosed. An example apparatus includes memory; instructions in the apparatus; and hardware agent to execute the instructions to: obtain a battery level; and during a boot protocol: determine that the battery level is below a threshold; determine a panel brightness based on the battery level, the panel brightness being less than a maximum brightness of the panel; and transmit instructions to a driver corresponding to the panel to cause the panel to operate at the determined amount of brightness.