[Graphics] Disabling unsupported GPU

[dreamwhite]

Hi, and thank you so much for the shared knowledge over the months. I actually came up to this page that explains how to disable unsupported GPUs but noticed a few errors:

1. Both -wegnoegpu and disable-external-gpu require WhateverGreen.kext injected
2. In case of multiple dGPUs systems (e.g. 4090+RX6800XT) the wisest way would be, after proper checking the definition of pci-bridges, use DeviceProperties and therefore use disable-gpu property.

I hope you will find this info useful somehow. Have a nice day

-- dreamwhite

[5T33Z0]

Hi. The things you point out are no "errors".

1. The requirement for Whatevergreen is mentioned in the instructions already!
2. What applies to disabling a single GPU is also applicable for a system with multiple GPUs. The only difference is a PCI Address.

[dreamwhite]

1. Sorry for the misunderstanding. What I was actually talking about is that only -wegnoegpu requires WhateverGreen, as far as I read the guide. I perfectly know your intentions, but it's not that clear actually.

2. With the SSDT it's fine, but in case of DeviceProperties, disable-external-gpu actually disables ALL the external GPUs rather than just a single one (which can be achieved by using disable-gpu)

[5T33Z0]

How can a DeveiceProperty injected into a single device disable ALL GPUS? For the boot-arg yes, I understand it, but for the DevProp, I ann pressty sure it only disables the device it is injected into – otherwise there would be no need to have it at all. It actually states "disable-gpu property to each GFX0" for the device property in the Whatevergreen repo.

I will update the info for Option 1 and add Option 3 for the rare edge case of multiple GPUs