Is there anything you can actually _do_ with the Apple GPUs outside of macOS? I know the Asahi Linux person was working on a driver for it, but is it in a useful state?
Yes. In fact it's accelerated and supports OpenGL 4.6 while macOS tops at OpenGL 4.1, and really mostly only supports Metal nowadays. With Asahi you can use OpenGL and Vulkan.
https://arstechnica.com/gadgets/2024/02/asahi-linux-projects...