Okay, loosing my mind here a bit. I just tested #OpenGL rendering under Linux on an #NVIDIA #H100 GPU, through #VirtualGL's #EGL backend.
And it worked... Renderer "NVIDIA H100/PCIe/SSE2", driver 555.42.06
I always understood the H100s to be incapable of OpenGL. But it seems I missed a crucial part in the H100 architecture doc (https://resources.nvidia.com/en-us-tensor-core), shown in the image.
Except, I'm sure I tested OpenGL at some point under X, but it didn't work. So, did anything change (e.g. driver)?