Add script and config file

egpu.conf

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+Section "Device"
+    Identifier "Device0"
+    Driver     "amdgpu"
+    BusID      "PCI:06:00:0" # Edit to match the PCI address of your AMD GPU
+EndSection
+
+Section "Module"
+    # Loading this allows offloading to the Intel GPU if you for some reason want that
+    Load "modesetting"
+EndSection

egpu.sh

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+#! /usr/bin/bash
+
+##
+#
+# Update EGPU_NAME to a string which can be used to find your eGPU via lspci.
+# If EGPU_NAME is found in the output of lspci, CONFIG_FILE will be copied to TARGET_FILE.
+# If it is not found, it will delete TARGET_FILE. So keep that in mind to make sure it does not delete any important config file.
+# Ensure the paths in both of those variables look correct.
+#
+##
+
+EGPU_NAME="Example string"
+CONFIG_FILE="/opt/config/egpu.conf"
+TARGET_FILE="/etc/X11/xorg.conf.d/egpu.conf"
+
+SCRIPT_NAME="eGPU script"
+
+echo "${SCRIPT_NAME}: Checking for GPU..."
+
+EGPU_DETECTION=`lspci | grep "$EGPU_NAME"`
+
+if [ -z "${EGPU_DETECTION}" ]; then
+  echo "${SCRIPT_NAME}: No GPU found, clearing config..."
+  rm -f $TARGET_FILE
+else
+  echo "${SCRIPT_NAME}: GPU found, setting as main gpu..."
+  cp $CONFIG_FILE $TARGET_FILE
+fi
+
+echo "${SCRIPT_NAME}: Done, proceeding."