I just tried to revive my old gaming tower, 10 yeares ago it was new. Now I wanted to try Subnautica on it, the game does not start, even though it kind of runs on my lower-spec laptop (Manjaro GNOME). What can I do about it? I got a Radeon HD 6770, dualcore i3, 4Gb RAM, 8GB Swap, 256GB SSD.
What Info do I need to get?
No vulkan means no vulkan. Vulkan is needed on Linux for gaming modern games, since DirectX is Windows only. If your card was supported by the amdgpu driver instead of the radeon driver, you would have vulkan support, but it is not. OpenGL can work, but not with Dx10/11/12.