Stupid question: does AMD contribute to RADV and mesa? As in, are they the main contributors to the amd drivers in Linux? I assume that they are at least significant contributors? For situations like this where support is dropped by AMD, does that mean that they will still patch card specific issues, or do other contributors take care of that?

(I know the drivers aren’t necessarily card specific overall, but what happens if a specific unsupported card has an issue with a new driver?)