Solved! See the bug tracker! Enjoy!

Thank you for your answer. Just my errors. Solved :)

Thank you for your answer. Just my errors. It works. Solved :)

Thank you for all!

And I would also like to understand what the environment variable is that identifies the correct driver (assuming one is necessary).

I probably didn’t express myself well. I meant to ask how it’s possible to verify the functioning of hardware video acceleration on ARM SoCs. It seems that the tools used for Intel, AMD and NVIDIA GPUs are not suitable for this. Regarding the model, I would be specifically interested in the SoC of the new Raspberry Pi 500+ (I have no idea what model it is).