How does hardware video acceleration work on ARM? I would like to install Fedora on a Raspberry Pi, but first I would like to make sure I can take advantage of hardware video acceleration. Most likely ARM GPUs don’t support VAAPI and I don’t think there are tools equivalent to vainfo and intel_gpu_top. I’m looking for someone who can provide me with information on this topic 🙂 Thanks

And I would also like to understand what the environment variable is that identifies the correct driver (assuming one is necessary).
It’s not an environment variable, it’s the kernel detecting and loading the proper modules that hand off acceleration to userspace driver packages like Mesa.