Add a initcpio hook to include nouveau and nvidia

mkosi.extra/usr/lib/initcpio/install/nvidia-module-selection

@@ -0,0 +1,18 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2026 Thomas Duckworth <tduck@filotimoproject.org>
+
+# Necessary for letting udev control what GPUs get which drivers
+# using driver_override, so nouveau or nvidia can be dynamically selected.
+# Also gives us some certainty that these are included for kernel modesetting.
+
+build() {
+    add_module "nvidia"
+    add_module "nvidia-drm"
+    add_module "nvidia-modeset"
+    add_module "nvidia-uvm"
+
+    add_module "nouveau"
+
+    add_checked_modules "/drivers/gpu/drm"
+}

mkosi.extra/usr/lib/rebuild-efi

@@ -27,9 +27,9 @@ fi
 # NOTE: plymouth MUST be after systemd as per the wiki!
 cat <<- EOF > mkinitcpio.conf
 MODULES=(overlay)
-BINARIES=(nvidia nouveau) # Ensure both drivers are pulled into the initrd (see mkosi.postinst.chroot)
+BINARIES=()
 FILES=(/usr/lib/udev/rules.d/05-nvidia-module-selection.rules) # Determine which driver is used at boot with udev
-HOOKS=(base systemd modconf kms keyboard block sd-encrypt filesystems fsck systemd-extension plymouth microcode sd-shutdown)
+HOOKS=(base systemd nvidia-module-selection modconf kms keyboard block sd-encrypt filesystems fsck systemd-extension plymouth microcode sd-shutdown)
 EOF
 
 echo "rw \