cat graphics/drm-current-kmod/pkg-message
[
{ type: install
  message: <<EOM
The experimental drm-current-kmod port can be enabled for amdgpu (for AMD
GPUs starting with the HD7000 series / Tahiti) or i915kms (for Intel
APUs starting with HD3000 / Sandy Bridge) through kld_list in
/etc/rc.conf. radeonkms for older AMD GPUs can be loaded and there are
some positive reports if EFI boot is NOT enabled (similar to amdgpu).

For amdgpu: kld_list="amdgpu"
For Intel: kld_list="i915kms"
For radeonkms: kld_list="radeonkms"

Please ensure that all users requiring graphics are members of the
"video" group.

Older generations are supported by the legacy kms modules (radeonkms /
i915kms) in base or by installing graphics/drm-legacy-kmod.
EOM
}
]