diff -ru ../orig/unity-7.4.0+16.04.20160906/lockscreen/BackgroundSettings.cpp lockscreen/BackgroundSettings.cpp
--- ../orig/unity-7.4.0+16.04.20160906/lockscreen/BackgroundSettings.cpp	2016-09-06 19:17:02.000000000 -0400
+++ lockscreen/BackgroundSettings.cpp	2017-10-09 19:50:57.516100799 -0400
@@ -53,20 +53,20 @@
   auto& settings = Settings::Instance();
 
   nux::CairoGraphics cairo_graphics(CAIRO_FORMAT_ARGB32, geo.width, geo.height);
-  cairo_surface_set_device_scale(cairo_graphics.GetSurface(), scale, scale);
   cairo_t* c = cairo_graphics.GetInternalContext();
 
-  double s_width = geo.width / scale;
-  double s_height = geo.height / scale;
   cairo_surface_t* bg_surface = nullptr;
 
   if (settings.use_user_background())
   {
-    bg_surface = gnome_bg_create_surface(gnome_bg_, gdk_get_default_root_window(), s_width, s_height, FALSE);
+    nux::Geometry const& screen_geo = UScreen::GetDefault()->GetScreenGeometry();
+    cairo_surface_t* tmp = gnome_bg_create_surface(gnome_bg_, gdk_get_default_root_window(), screen_geo.width, screen_geo.height, TRUE);
+    bg_surface = cairo_surface_create_for_rectangle(tmp, geo.x, geo.y, geo.width, geo.height);
+    cairo_surface_destroy(tmp);
   }
   else if (!settings.background().empty())
   {
-    glib::Object<GdkPixbuf> pixbuf(gdk_pixbuf_new_from_file_at_scale(settings.background().c_str(), s_width, s_height, FALSE, NULL));
+    glib::Object<GdkPixbuf> pixbuf(gdk_pixbuf_new_from_file_at_scale(settings.background().c_str(), geo.width, geo.height, FALSE, NULL));
 
     if (pixbuf)
       bg_surface = gdk_cairo_surface_create_from_pixbuf(pixbuf, 0, NULL);
@@ -85,6 +85,10 @@
     cairo_paint(c);
   }
 
+  cairo_surface_set_device_scale(cairo_graphics.GetSurface(), scale, scale);
+  double s_width = geo.width / scale;
+  double s_height = geo.height / scale;
+
   if (!settings.logo().empty())
   {
     int grid_x_offset = GetGridOffset(s_width);