Im getting a loud hum from my external speakers plugged into the headphone jack of my laptop. However the hum is only there when I power down the laptop. Ive unplugged the power and booted using the laptop battery and then powered down and it still hums, even when the power cord is unplugged. I tried plugging in a different portable speaker with a different audio cable and got the same hum when powered down. when the laptop is powered on I have no issues with hum or buzz and the audio sound is just fine. Its only when i power down or put the laptop to sleep. I dont wanna have to unplug the headphone jack every time i power down.
I also tried my wifes asus laptop with my speakers and everything was fine. Ive updated all drivers etc etc and ran many diagnostic tools available with dell support assist and had no success