[1] links to https://github.com/RadeonOpenCompute/ROCm/issues/2198 which has all the context (driver bugs, vowing to stop using AMD, Lisa Su's response that they're committed to fixing this stuff, a comment that it's fixed)
He had abandoned them for about a week but then talked to the CEO and that got things back on track IIRC
George Hotz: because eventually Elon Musk's false promises and over the top shenanigans just weren't doing it for you anymore...