Re: FreeBSD-amd64 driver ?
There's been no back and forth that I'm aware of and to the best of my knowledge, the need for the features requested in an email to freebsd-hackers has been neither disputed nor has a lack of details been brought to my attention. As far as I know, the work required is understood by at least some FreeBSD developers (e.g. John Baldwin) and is blocked on either lack of time/resources or other kernel development work.
NVIDIA has expressed interest in working with FreeBSD developers to help make it possible to provide NVIDIA graphics drivers for FreeBSD/amd64, as well as to achieve feature parity with the Linux/Solaris graphics drivers on FreeBSD/i386, but any such support continues to be gated by the features in question.