Another person getting No Signal.

bash
#!/usr/bin/env bash
set -euo pipefail

LOG="$PWD/boot-passthrough-$(date +%Y%m%d-%H%M%S).log"
exec > >(tee -a "$LOG") 2>&1
echo "Logging to: $LOG"

MY_OPTIONS="+ssse3,+sse4.2,+popcnt,+avx,+aes,+xsave,+xsaveopt,check"

ALLOCATED_RAM="16384"
CPU_SOCKETS="1"
CPU_CORES="4"
CPU_THREADS="8"

REPO_PATH="."
OVMF_DIR="."

GPU="0000:0d:00.0"
GPU_AUDIO="0000:0d:00.1"
GPU_ID="1002 73df"
GPU_AUDIO_ID="1002 ab28"

cleanup() {
  echo "Restoring GPU..."
  echo "$GPU" | sudo tee "/sys/bus/pci/devices/$GPU/driver/unbind" >/dev/null 2>&1 || true
  echo "$GPU_AUDIO" | sudo tee "/sys/bus/pci/devices/$GPU_AUDIO/driver/unbind" >/dev/null 2>&1 || true

  sudo modprobe amdgpu || true
  echo "$GPU" | sudo tee /sys/bus/pci/drivers/amdgpu/bind >/dev/null 2>&1 || true

  sudo systemctl start display-manager >/dev/null 2>&1 || true
}
trap cleanup EXIT

echo 1 | sudo tee /sys/module/kvm/parameters/ignore_msrs >/dev/null

echo "Stopping desktop..."
sudo systemctl stop display-manager
sleep 3

sudo modprobe vfio-pci

echo "Binding GPU to vfio-pci..."
echo vfio-pci | sudo tee "/sys/bus/pci/devices/$GPU/driver_override"
echo vfio-pci | sudo tee "/sys/bus/pci/devices/$GPU_AUDIO/driver_override"

echo "$GPU" | sudo tee "/sys/bus/pci/devices/$GPU/driver/unbind" || true
echo "$GPU_AUDIO" | sudo tee "/sys/bus/pci/devices/$GPU_AUDIO/driver/unbind" || true

sudo modprobe vfio-pci

echo "$GPU" | sudo tee /sys/bus/pci/drivers_probe
echo "$GPU_AUDIO" | sudo tee /sys/bus/pci/drivers_probe

lspci -nnk -s 0d:00.0
lspci -nnk -s 0d:00.1
ls -l /dev/vfio

sleep 2

args=(
  -enable-kvm
  -m "$ALLOCATED_RAM"
  -cpu Penryn,kvm=on,vendor=GenuineIntel,+invtsc,vmware-cpuid-freq=on,"$MY_OPTIONS"
  -machine q35
  -usb
  -device usb-kbd
  -device usb-tablet
  -device usb-mouse
  -smp "$CPU_THREADS",cores="$CPU_CORES",sockets="$CPU_SOCKETS"
  -device usb-ehci,id=ehci
  -vga virtio-vga

  -device vfio-pci,host=0d:00.0,multifunction=on,x-no-kvm-intx=on
  -device vfio-pci,host=0d:00.1

  -device isa-applesmc,osk="ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc"
  -drive if=pflash,format=raw,readonly=on,file="$REPO_PATH/$OVMF_DIR/OVMF_CODE_4M.fd"
  -drive if=pflash,format=raw,file="$REPO_PATH/$OVMF_DIR/OVMF_VARS-1024x768.fd"
  -smbios type=2

  -device ich9-intel-hda
  -device hda-duplex
  -device ich9-ahci,id=sata

  -drive id=OpenCoreBoot,if=none,snapshot=on,format=qcow2,file="$REPO_PATH/OpenCore/OpenCore.qcow2"
  -device ide-hd,bus=sata.2,drive=OpenCoreBoot

  #-drive id=InstallMedia,if=none,file="$REPO_PATH/#BaseSystem.img",format=raw
  #-device ide-hd,bus=sata.3,drive=InstallMedia

  -drive id=MacHDD,if=none,file="$REPO_PATH/mac_hdd_ng.img",format=qcow2
  -device ide-hd,bus=sata.4,drive=MacHDD

  -netdev user,id=net0
  -device vmxnet3,netdev=net0,id=net0,mac=52:54:00:c9:18:27

  -monitor stdio
  -vnc 0.0.0.0:1,password=off
  -k en-us
)

qemu-system-x86_64 "${args[@]}"

I have an AMD Radeon RX 6700 XT graphics card, and yes, I have NootRX. This is specifically for macOS 26 Tahoe