diff --git a/src/backends/meta-crtc.c b/src/backends/meta-crtc.c
index 8d27d204e..7235df263 100644
--- a/src/backends/meta-crtc.c
+++ b/src/backends/meta-crtc.c
@@ -112,11 +112,17 @@ meta_crtc_get_all_transforms (MetaCrtc *crtc)
 
 void
 meta_crtc_set_config (MetaCrtc       *crtc,
-                      MetaCrtcConfig *config)
+                      MetaCrtcConfig *config,
+                      gpointer        backend_private)
 {
   MetaCrtcPrivate *priv = meta_crtc_get_instance_private (crtc);
+  MetaCrtcClass *klass = META_CRTC_GET_CLASS (crtc);
 
   meta_crtc_unset_config (crtc);
+
+  if (klass->set_config)
+    klass->set_config (crtc, config, backend_private);
+
   priv->config = config;
 }
 
@@ -136,6 +142,20 @@ meta_crtc_get_config (MetaCrtc *crtc)
   return priv->config;
 }
 
+gboolean
+meta_crtc_assign_extra (MetaCrtc            *crtc,
+                        MetaCrtcAssignment  *crtc_assignment,
+                        GPtrArray           *crtc_assignments,
+                        GError             **error)
+{
+  MetaCrtcClass *klass = META_CRTC_GET_CLASS (crtc);
+
+  if (klass->assign_extra)
+    return klass->assign_extra (crtc, crtc_assignment, crtc_assignments, error);
+  else
+    return TRUE;
+}
+
 size_t
 meta_crtc_get_gamma_lut_size (MetaCrtc *crtc)
 {
diff --git a/src/backends/meta-crtc.h b/src/backends/meta-crtc.h
index b39c23b93..8e4e00f68 100644
--- a/src/backends/meta-crtc.h
+++ b/src/backends/meta-crtc.h
@@ -46,6 +46,15 @@ struct _MetaCrtcClass
 
   void (* set_gamma_lut) (MetaCrtc           *crtc,
                           const MetaGammaLut *lut);
+
+  gboolean (* assign_extra) (MetaCrtc            *crtc,
+                             MetaCrtcAssignment  *crtc_assignment,
+                             GPtrArray           *crtc_assignments,
+                             GError             **error);
+
+  void (* set_config) (MetaCrtc             *crtc,
+                       const MetaCrtcConfig *config,
+                       gpointer              backend_private);
 };
 
 META_EXPORT_TEST
@@ -71,7 +80,8 @@ MetaMonitorTransform meta_crtc_get_all_transforms (MetaCrtc *crtc);
 
 META_EXPORT_TEST
 void meta_crtc_set_config (MetaCrtc       *crtc,
-                           MetaCrtcConfig *config);
+                           MetaCrtcConfig *config,
+                           gpointer        backend_private);
 
 META_EXPORT_TEST
 void meta_crtc_unset_config (MetaCrtc *crtc);
@@ -79,6 +89,11 @@ void meta_crtc_unset_config (MetaCrtc *crtc);
 META_EXPORT_TEST
 const MetaCrtcConfig * meta_crtc_get_config (MetaCrtc *crtc);
 
+gboolean meta_crtc_assign_extra (MetaCrtc            *crtc,
+                                 MetaCrtcAssignment  *crtc_assignment,
+                                 GPtrArray           *crtc_assignments,
+                                 GError             **error);
+
 size_t meta_crtc_get_gamma_lut_size (MetaCrtc *crtc);
 
 MetaGammaLut * meta_crtc_get_gamma_lut (MetaCrtc *crtc);
diff --git a/src/backends/meta-monitor-config-manager.c b/src/backends/meta-monitor-config-manager.c
index 60f32ff4c..6d81822e9 100644
--- a/src/backends/meta-monitor-config-manager.c
+++ b/src/backends/meta-monitor-config-manager.c
@@ -261,6 +261,12 @@ assign_monitor_crtc (MetaMonitor         *monitor,
   };
   g_ptr_array_add (crtc_assignment->outputs, output);
 
+  if (!meta_crtc_assign_extra (crtc,
+                               crtc_assignment,
+                               data->crtc_assignments,
+                               error))
+    return FALSE;
+
   /*
    * Only one output can be marked as primary (due to Xrandr limitation),
    * so only mark the main output of the first monitor in the logical monitor
@@ -1748,6 +1754,8 @@ meta_monitors_config_class_init (MetaMonitorsConfigClass *klass)
 static void
 meta_crtc_assignment_free (MetaCrtcAssignment *assignment)
 {
+  g_clear_pointer (&assignment->backend_private,
+                   assignment->backend_private_destroy);
   g_ptr_array_free (assignment->outputs, TRUE);
   g_free (assignment);
 }
diff --git a/src/backends/meta-monitor-manager-dummy.c b/src/backends/meta-monitor-manager-dummy.c
index 28f34f945..06e150418 100644
--- a/src/backends/meta-monitor-manager-dummy.c
+++ b/src/backends/meta-monitor-manager-dummy.c
@@ -522,7 +522,8 @@ apply_crtc_assignments (MetaMonitorManager    *manager,
           crtc_config = meta_crtc_config_new (&crtc_assignment->layout,
                                               crtc_assignment->mode,
                                               crtc_assignment->transform);
-          meta_crtc_set_config (crtc, crtc_config);
+          meta_crtc_set_config (crtc, crtc_config,
+                                crtc_assignment->backend_private);
 
           for (j = 0; j < crtc_assignment->outputs->len; j++)
             {
diff --git a/src/backends/meta-monitor-manager-private.h b/src/backends/meta-monitor-manager-private.h
index 2d45fe777..5f2f6846e 100644
--- a/src/backends/meta-monitor-manager-private.h
+++ b/src/backends/meta-monitor-manager-private.h
@@ -87,6 +87,9 @@ struct _MetaCrtcAssignment
   graphene_rect_t layout;
   MetaMonitorTransform transform;
   GPtrArray *outputs;
+
+  gpointer backend_private;
+  GDestroyNotify backend_private_destroy;
 };
 
 /*
diff --git a/src/backends/native/meta-monitor-manager-native.c b/src/backends/native/meta-monitor-manager-native.c
index df0a4b5ed..44600be57 100644
--- a/src/backends/native/meta-monitor-manager-native.c
+++ b/src/backends/native/meta-monitor-manager-native.c
@@ -220,7 +220,8 @@ apply_crtc_assignments (MetaMonitorManager    *manager,
           crtc_config = meta_crtc_config_new (&crtc_assignment->layout,
                                               crtc_assignment->mode,
                                               crtc_assignment->transform);
-          meta_crtc_set_config (crtc, crtc_config);
+          meta_crtc_set_config (crtc, crtc_config,
+                                crtc_assignment->backend_private);
 
           for (j = 0; j < crtc_assignment->outputs->len; j++)
             {
diff --git a/src/backends/x11/meta-crtc-xrandr.c b/src/backends/x11/meta-crtc-xrandr.c
index 19e7b942d..0b2d8cffe 100644
--- a/src/backends/x11/meta-crtc-xrandr.c
+++ b/src/backends/x11/meta-crtc-xrandr.c
@@ -293,7 +293,7 @@ meta_crtc_xrandr_new (MetaGpuXrandr      *gpu_xrandr,
                                                    crtc_xrandr->rect.height),
                               crtc_xrandr->current_mode,
                               crtc_xrandr->transform);
-      meta_crtc_set_config (META_CRTC (crtc_xrandr), crtc_config);
+      meta_crtc_set_config (META_CRTC (crtc_xrandr), crtc_config, NULL);
     }
 
   return crtc_xrandr;
diff --git a/src/backends/x11/meta-monitor-manager-xrandr.c b/src/backends/x11/meta-monitor-manager-xrandr.c
index 2d8fd4d9c..404faf189 100644
--- a/src/backends/x11/meta-monitor-manager-xrandr.c
+++ b/src/backends/x11/meta-monitor-manager-xrandr.c
@@ -560,7 +560,8 @@ apply_crtc_assignments (MetaMonitorManager    *manager,
           crtc_config = meta_crtc_config_new (&crtc_assignment->layout,
                                               crtc_mode,
                                               crtc_assignment->transform);
-          meta_crtc_set_config (crtc, crtc_config);
+          meta_crtc_set_config (crtc, crtc_config,
+                                crtc_assignment->backend_private);
         }
     }
 
diff --git a/src/tests/meta-monitor-manager-test.c b/src/tests/meta-monitor-manager-test.c
index aa98b0600..f9275160c 100644
--- a/src/tests/meta-monitor-manager-test.c
+++ b/src/tests/meta-monitor-manager-test.c
@@ -184,7 +184,8 @@ apply_crtc_assignments (MetaMonitorManager    *manager,
           crtc_config = meta_crtc_config_new (&crtc_assignment->layout,
                                               crtc_assignment->mode,
                                               crtc_assignment->transform);
-          meta_crtc_set_config (crtc, crtc_config);
+          meta_crtc_set_config (crtc, crtc_config,
+                                crtc_assignment->backend_private);
 
           for (j = 0; j < crtc_assignment->outputs->len; j++)
             {