From 711dd044448c29a93798edeced1faf0aff7a864e Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Sat, 17 Oct 2015 15:01:17 -0400
Subject: [PATCH] xrandr: set stage to black before dpms off

redraws aren't processed when dpms has been turned
off, so we need to set the stage to black before
the screen goes dark, so that when it comes back
it's not showing stale contents.
---
 .../x11/meta-monitor-manager-xrandr.c         | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/backends/x11/meta-monitor-manager-xrandr.c b/src/backends/x11/meta-monitor-manager-xrandr.c
index 900884170..3c114cf71 100644
--- a/src/backends/x11/meta-monitor-manager-xrandr.c
+++ b/src/backends/x11/meta-monitor-manager-xrandr.c
@@ -43,6 +43,8 @@
 #include <meta/errors.h>
 #include "meta-monitor-config.h"
 
+#include "meta-stage.h"
+
 #define ALL_TRANSFORMS ((1 << (META_MONITOR_TRANSFORM_FLIPPED_270 + 1)) - 1)
 
 /* Look for DPI_FALLBACK in:
@@ -646,6 +648,23 @@ get_xmode_name (XRRModeInfo *xmode)
   return g_strdup_printf ("%dx%d", width, height);
 }
 
+static void
+update_stage_visibility_for_power_save_mode (MetaMonitorManager *manager)
+{
+  MetaBackend *backend = meta_get_backend ();
+  ClutterActor *stage = meta_backend_get_stage (backend);
+
+  if ((manager->power_save_mode != META_POWER_SAVE_ON) &&
+      (manager->power_save_mode != META_POWER_SAVE_UNSUPPORTED))
+    {
+      meta_stage_set_black (META_STAGE (stage), TRUE);
+    }
+  else
+    {
+      meta_stage_set_black (META_STAGE (stage), FALSE);
+    }
+}
+
 static void
 meta_monitor_manager_xrandr_read_current (MetaMonitorManager *manager)
 {
@@ -693,6 +712,8 @@ meta_monitor_manager_xrandr_read_current (MetaMonitorManager *manager)
       manager->power_save_mode = META_POWER_SAVE_UNSUPPORTED;
     }
 
+  update_stage_visibility_for_power_save_mode (manager);
+
   XRRGetScreenSizeRange (manager_xrandr->xdisplay, DefaultRootWindow (manager_xrandr->xdisplay),
 			 &min_width,
 			 &min_height,