I was running Unraid 6.12.15 with VM GPU passthrough configured (Intel UHD Graphics 730), outputting to a monitor.
I was using a VBIOS from this GitHub https://github.com/patmagauran/i915ovmfPkg .
After the update, I no longer get any video output on the monitor. In the logs, I see the following error:
qemu-system-x86_64: -device {"driver":"vfio-pci","host":"0000:00:02.0","id":"hostdev0","bus":"pci.0","addr":"0x2","romfile":"/mnt/cache/isos/vbios/vbios_gvt_uefi.rom"}: IGD device 0000:00:02.0 is unsupported in legacy mode, try SandyBridge or newer
I created a new VM (tryed Q35) and attached the old VBIOS, but the "legacy mode" error remains unresolved.
Downgrade back to Unraid 6.12.15
But now i have new error: (Fixed after rebooting)