[QUESTION] Modding an AMI bios to bypass the dGPU completely

[misty]

Hi, I have an old DELL Inspiron 5423 notebook that has a discrete Radeon GPU. I was having issues with video and booting that pointed at this Radeon Chip as the problem. I looked for the schematics to do a discrete to UMA conversion but I didn´t really have the tools to do it so I just removed the power supply to the Radeon chip (as some had suggested to me) and it worked!

Now the issue is the that motherboard thinks there´s a problem with the dGPU and makes 5 annoying beeps in sequence after booting and it doesn´t stop, ever, even in Windows.

I was thinking if it´s possible to remove either the dGpu from the bios somehow or trick the dGpu side of the bios to think there´s no problem with the dGpu to avoid the beeps.

I have modded the bios of this notebook before but only to enable the advanced menu. I was wondering if someone ever did something like this before?

[misty]

To answer my own question, yes this is possible. After modding the bios to enable the advanced menus and going to the Northbridge sub-menu configuration there´s an option to disable the PEG completely, doing that cuts off the power by software to the Radeon chip (although that was already done by hardware in my case) and the notebook thinks everything is alright again.