This was pitched by AMD as "Yeah, our new proprietary driver can use the same kernel stub as the libre driver" with minor modifications a year ago, and instead

This was pitched by AMD as "Yeah, our new proprietary driver can use the same kernel stub as the libre driver" with minor modifications a year ago, and instead what was delivered was a giant HAL that only AMD can maintain. I get why its not being mainlined, this is AMD's screwup.