Hifiberry digi+ pro external supply problem

Hello, I use an external 5V power supply for power supply. Via the P3 connector. the power Supply is switched on with a certain delay(smooth switching on). This does not load the hifiberry digi+ pro card. You have to turn on the power supply, and after a couple of seconds connect the power through the P3 connector. Is there any software way out of this situation?

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