I am curious how far things proceed with booting the USB as we haven't established that, yet.
1.a. GhostBSD UEFI (Expected on newer hardware)

1.b GhostBSD BIOS/Legacy

If you're past the boot loader, recent FreeBSD/GitHub/Reddit forums suggest that;
- The the port is ahead of the package a little, but enough that it matters.
https://www.reddit.com/r/freebsd/comments/1j2fto2/intel_arc_igpu_support/
You can probably test this by giving FreeBSD 15-CURRENT a spin.
Important note - `kldload i915kms` does not work if you have not done `kldload linuxkpi_video' before.
This Pull Request at FreeBSD indicates things are in progress, but an unknown arrival time in FreeBSD R14.2p? and subsequently GhostBSD 25.?
Update firmwares for DRM drivers from Linux 6.7 #36