Disabling ErP in my BIOS? ASRock B450M Pro4

[DrMacintosh]

Hello, so I know that most boards these days send power even though the rest of the computer is turned off. This is often called "ErP"  With previous systems I would disable this feature to ensure that my USB microphone and my power LED would turn off once I shut down the computer. My power LED is unique since my system is built inside a PowerMac G5 case with a modified front panel. My power LED is a modified G5 PoweMac front panel LED that functions using a special cable that works like this: https://imgur.com/a/eLw5tCg. Spoiler The cable uses the + pins for the power switch and front panel LED. With my ASRock B450M Pro4 however, I can't seem to find any ErP settings. I know that the "Deep Sleep" setting in the BIOS is supposed to do what I want, however even with Deep Sleep enabled, my Mic and power LED remain lit after shutting down. If anyone knows how I can disable ErP support, or a setting that will make the power LED turn off at shutdown, I would be extremely appreciative.

 

[WereCatf]

10 minutes ago, DrMacintosh said:

or a setting that will make the power LED turn off at shutdown

Couldn't you just modify the power-LED to use the correct GND-pin instead? You know, disconnect the LED's GND-pin from whatever it's connected to at the moment, solder a new lead to it and then connect it to the corresponding GND-pin on the front-panel header. It'd work like a normal PC power-LED, then.

 

EDIT: Tbh, I'm not even sure I understand the issue correctly. On all the mobos I have, the +V - pin is the one controlling whether the power-LED is on or not, not the GND - pin, so either your mobo is weird or the LED is connected to the wrong pin?

[DrMacintosh]

6 hours ago, WereCatf said:

On all the mobos I have, the +V - pin is the one controlling whether the power-LED is on or not, not the GND - pin

The G5 has a daughter board that controls the power button, front IO, and the power LED. There is a cable that has those headers seen in the photo and only those headers. 

 

There is only a + pin for the LED and switch which goes on the + pins on the front panel header.