Check automatic GPU loading in GhostBSD and NomadBSD

[probonopd]

Check automatic GPU loading in GhostBSD and NomadBSD. Ideally we can boot straight into Xorg without any manual interaction.

[probonopd]

https://github.com/nomadbsd/NomadBSD/blob/master/config/etc/rc.d/initgfx

In the meantime, consider

/usr/sbin/sysrc -f /etc/rc.conf kld_list+="sysctlinfo cuse utouch i915kms" >/dev/null 2>/dev/null

but according to https://github.com/furybsd/furybsd-livecd/issues/151#issuecomment-706781170 this is not a clean future-proof solution.

[probonopd]

Message from drm-fbsd12.0-kmod-4.16.g20200221:

--
The drm-fbsd12.0-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="/boot/modules/i915kms.ko"
For radeonkms: kld_list="/boot/modules/radeonkms.ko"

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.

[probonopd]

So we must detect the GPU and insert the matching one at runtime into overlays/uzip/furybsd-live-settings/files/usr/local/bin/furybsd-init-helper?

[probonopd]

Switched to using initgfx from NomadBSD.