Post by stapledbattery on Dec 29, 2020 19:40:08 GMT
As far as I know, all Mac laptops with discrete GPUs also have an integrated GPU which macOS uses normally, only switching to the discrete GPU when more performance is needed. The main advantage of this is lower power consumption, but there are others—for example, Intel's video encoding and decoding is much better than AMD's on my computer.
In Bootcamp, the integrated GPU is completely disabled by default. It can be enabled at boot with apple-set-os.efi. Apple laptops have a piece of hardware, called gMux, that can switch the internal display between the integrated and discrete GPU. This is different from most Windows laptops with discrete GPUs, which usually connect only the integrated GPU's video output to the display and use software to output the discrete GPU's framebuffer through the integrated GPU. Windows can't control gMux directly, but gpu-switch can be used to tell the EFI to boot with the integrated GPU connected. The goal is to use the two GPUs like any other Windows laptop, with graphics-intensive apps running on the discrete GPU but being outputted via the integrated GPU.
Unfortunately, this doesn't work. If apple-set-os.efi is used to enable the integrated GPU, the dedicated GPU's driver crashes.
This happens with both the official drivers from AMD and bootcampdrivers.com's drivers, but I thought you guys might have some insight on how to fix this.
Additional info: 2015 15-inch MacBook Pro, R9 M370X, driver date 8/26/2020, driver version 27.20.12027.1001, Windows 10 2004
