Add a post install script for surface-config.

pkg/arch/surface/PKGBUILD

@@ -21,6 +21,7 @@ _package-firmware() {
 }
 
 _package-config() {
+  install=surface-config.install
   pkgdesc="Surface config files"
   cd ${srcdir}/${_srcname}/
   cp -r root/etc "${pkgdir}/etc/"

pkg/arch/surface/surface-config.install

@@ -0,0 +1,5 @@
+# arg 1:  the new package version
+post_install() {
+  echo "Surface Go users: Enable power management for Surface Go touchscreen"
+  echo "    sudo systemctl enable -q surfacego-touchscreen"
+}