Support for ATI radeon cards there isn't anymore.
However, it's a pity reading in Xorg messages that radeon driver does support all those ATI card, but kernel compiled in "make.conf" with "NEW-XORG=YES" and "KMS=YES" uses radeonkms instead, that complains about a drmn.ko that doesn't exist in system, and so X fails back to VESA (if you edit conf file).
My question is: is it possible to make kernel use old graphic system, making it use old (and working) radeon.ko?

The new KMS for ATI, should work might not work properly under GhostBSD I have no ATI hardware to test it and make it work properly.
Can you start drmn?

drmn.ko simply there isn't. There are "drm" and "drm2" instead, but loading latter and then loading radeonkms causes system to crash.

I will need to by myself ATI card to fix that old issue.

ko that doesn't exist in system, and so X fails back to VESA (if you edit conf file). My question is: is it possible to make kernel use old graphic system, making it use old (and working) radeon.ko?..??