1 files changed, 87 insertions, 0 deletions
diff --git a/dgpu-toggle/usr/local/bin/gpu-toggle b/dgpu-toggle/usr/local/bin/gpu-toggle
new file mode 100755
index 0000000..4e1ddd2
--- /dev/null
+++ b/dgpu-toggle/usr/local/bin/gpu-toggle
@@ -0,0 +1,87 @@
+#!/bin/bash
+
+# -------------------------------------------------------------------------
+# GPU-SWITCH: Discrete Graphics Power & Bus Management
+# Target: Razer Blade Stealth 13 (Late 2019) | Void Linux
+# -------------------------------------------------------------------------
+
+# Configuration: Static PCI Identifier for Turing dGPU
+# We use a static ID because the device disappears from the bus when disabled.
+DEVICE_ID="57:00.0"
+PCI_PATH="/sys/bus/pci/devices/0000:$DEVICE_ID"
+REQUIRED_MODULES=("nvidia_drm" "nvidia_modeset" "nvidia_uvm" "nvidia")
+
+if [[ $EUID -ne 0 ]]; then
+   echo "[ERROR] Elevated privileges required. Please execute with sudo."
+   exit 1
+fi
+
+check_status() {
+    echo "--- System Graphics Status ---"
+    if [ -d "$PCI_PATH" ]; then
+        echo "Hardware State:  [ ONLINE ] at $DEVICE_ID"
+        if lsmod | grep -q "nvidia"; then
+            echo "Driver State:    [ LOADED ]"
+        else
+            echo "Driver State:    [ UNLOADED ]"
+        fi
+    else
+        echo "Hardware State:  [ OFFLINE ] (Device removed from PCI bus)"
+        echo "Driver State:    [ UNLOADED ]"
+    fi
+    echo "------------------------------"
+}
+
+disable_gpu() {
+    echo "[INFO] Initializing dGPU shutdown sequence..."
+
+    # 1. Unload Kernel Modules
+    echo "[STEP 1/2] Terminating NVIDIA kernel modules..."
+    for mod in "${REQUIRED_MODULES[@]}"; do
+        if lsmod | grep -q "$mod"; then
+            modprobe -r "$mod" 2>/dev/null
+            if [ $? -ne 0 ]; then
+                echo "[WARN] Module $mod is currently in use. Ensure Xorg/i3 is not using the dGPU."
+            fi
+        fi
+    done
+
+    # 2. Physical Bus Removal
+    if [ -d "$PCI_PATH" ]; then
+        echo "[STEP 2/2] Detaching device from PCI bus..."
+        echo 1 > "$PCI_PATH/remove"
+        echo "[SUCCESS] dGPU has been isolated and powered down."
+    else
+        echo "[SKIP] Device is already detached from the bus."
+    fi
+}
+
+enable_gpu() {
+    echo "[INFO] Initializing dGPU activation sequence..."
+
+    # 1. Trigger PCI Rescan
+    echo "[STEP 1/2] Scanning PCI bridge for hardware changes..."
+    echo 1 > /sys/bus/pci/rescan
+    
+    # Allow firmware-level handshake
+    sleep 2
+
+    # 2. Validate and Load Drivers
+    if [ -d "$PCI_PATH" ]; then
+        echo "[STEP 2/2] Hardware detected at $DEVICE_ID. Loading modules..."
+        for mod in "nvidia" "nvidia_uvm" "nvidia_modeset" "nvidia_drm"; do
+            modprobe "$mod"
+        done
+        echo "[SUCCESS] dGPU is now online and available for Prime Offload."
+    else
+        echo "[FATAL] Hardware failed to initialize at $DEVICE_ID."
+        echo "[DEBUG] Check 'dmesg | tail' for PCI link training errors."
+    fi
+}
+
+case "$1" in
+    on)     enable_gpu ;;
+    off)    disable_gpu ;;
+    status) check_status ;;
+    *)      echo "Usage: gpu-switch {on|off|status}" ;;
+esac