Toggle hybrid GPU mode via supergfxctl

Very useful for Asus G14 and other laptops with NVIDIA + AMD iGPU
combos.

default/systemd/system-sleep/force-igpu.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# Use the Vfio to Integrated trick to put turn off NVIDIA dgpu when in integrated mode
+# without needing to restart the computer. This is needed because computers like the Asus G14
+# will wake after suspend in Hybrid mode, even if the system was in Integrated mode before
+# suspending.
+
+case "$1" in
+  post)
+    # small delay so the device is fully re-enumerated
+    sleep 4
+
+    # force-bind dGPU to vfio (fully detached from nvidia)
+    /usr/bin/supergfxctl -m Vfio
+    sleep 1
+
+    # then go back to Integrated, which powers it off again
+    /usr/bin/supergfxctl -m Integrated
+    ;;
+esac
+
+exit 0