A method, in a data processing system, for controlling assertion of an imminent power loss notification signal notifying the data processing system of an imminent loss of power to a data processing device, comprising: determining a configuration of a data processing device within the data processing system, wherein the determination of the configuration comprises determining a position of the data processing device within the data processing system relative to a plurality of power domains (0,1) of the power distribution network of the data processing system; determining a current power distribution network configuration relative to the data processing device, based on the determined configuration of the data processing device within the data processing system, in response to a power supply module of the data processing system asserting an Early Power Off Warning (EPOW) signal, wherein the determination of the current power distribution network comprises identifying one or more power supply modules of a plurality of power domains (0,1) currently providing a valid power input to the data processing device based on the determined position of the data processing device; and asserting a power loss notification signal, indicative of an imminent power loss to the data processing device, to logic of the data processing system based on the determined current power distribution network configuration relative to the data processing device, wherein the asserting of the power loss notification signal comprises calculating a Power Line Disturbance filter time based on the determined configuration of the data processing device and the determined current power distribution network configuration; and asserting the power loss notification signal if the power supply module asserts the EPOW signal for longer than the PLD filter time. determining a configuration of a data processing device within the data processing system, wherein the determination of the configuration comprises determining a position of the data processing device within the data processing system relative to a plurality of power domains (0,1) of the power distribution network of the data processing system; determining a current power distribution network configuration relative to the data processing device, based on the determined configuration of the data processing device within the data processing system, in response to a power supply module of the data processing system asserting an Early Power Off Warning (EPOW) signal, wherein the determination of the current power distribution network comprises identifying one or more power supply modules of a plurality of power domains (0,1) currently providing a valid power input to the data processing device based on the determined position of the data processing device; and asserting a power loss notification signal, indicative of an imminent power loss to the data processing device, to logic of the data processing system based on the determined current power distribution network configuration relative to the data processing device, wherein the asserting of the power loss notification signal comprises calculating a Power Line Disturbance filter time based on the determined configuration of the data processing device and the determined current power distribution network configuration; and asserting the power loss notification signal if the power supply module asserts the EPOW signal for longer than the PLD filter time.