diff --git a/arch/sim/src/sim/posix/sim_x11framebuffer.c b/arch/sim/src/sim/posix/sim_x11framebuffer.c
index dd63e10d0bf..a5d98e91c4a 100644
--- a/arch/sim/src/sim/posix/sim_x11framebuffer.c
+++ b/arch/sim/src/sim/posix/sim_x11framebuffer.c
@@ -26,6 +26,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <syslog.h>
+#include <errno.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <sys/ipc.h>
@@ -106,8 +107,6 @@ static inline Display *sim_x11createframe(void)
   XSetWMProperties(display, g_window, &winprop, &iconprop, argv, 1,
                    &hints, NULL, NULL);
 
-  XMapWindow(display, g_window);
-
   /* Select window input events */
 
 #if defined(CONFIG_SIM_AJOYSTICK)
@@ -372,7 +371,7 @@ int sim_x11initialize(unsigned short width, unsigned short height,
   display = sim_x11createframe();
   if (display == NULL)
     {
-      return -1;
+      return -ENODEV;
     }
 
   /* Determine the supported pixel bpp of the current window */
@@ -403,6 +402,40 @@ int sim_x11initialize(unsigned short width, unsigned short height,
   return 0;
 }
 
+/****************************************************************************
+ * Name: sim_x11openwindow
+ ****************************************************************************/
+
+int sim_x11openwindow(void)
+{
+  if (g_display == NULL)
+    {
+      return -ENODEV;
+    }
+
+  XMapWindow(g_display, g_window);
+  XSync(g_display, 0);
+
+  return 0;
+}
+
+/****************************************************************************
+ * Name: sim_x11closewindow
+ ****************************************************************************/
+
+int sim_x11closewindow(void)
+{
+  if (g_display == NULL)
+    {
+      return -ENODEV;
+    }
+
+  XUnmapWindow(g_display, g_window);
+  XSync(g_display, 0);
+
+  return 0;
+}
+
 /****************************************************************************
  * Name: sim_x11cmap
  ****************************************************************************/
@@ -416,7 +449,7 @@ int sim_x11cmap(unsigned short first, unsigned short len,
 
   if (g_display == NULL)
     {
-      return -1;
+      return -ENODEV;
     }
 
   /* Convert each color to X11 scaling */
@@ -455,7 +488,7 @@ int sim_x11update(void)
 {
   if (g_display == NULL)
     {
-      return -1;
+      return -ENODEV;
     }
 
 #ifndef CONFIG_SIM_X11NOSHM
diff --git a/arch/sim/src/sim/sim_framebuffer.c b/arch/sim/src/sim/sim_framebuffer.c
index b0609acc4e4..66c2784164b 100644
--- a/arch/sim/src/sim/sim_framebuffer.c
+++ b/arch/sim/src/sim/sim_framebuffer.c
@@ -95,6 +95,11 @@ static int sim_setcursor(struct fb_vtable_s *vtable,
                         struct fb_setcursor_s *settings);
 #endif
 
+/* Open/close window. */
+
+static int sim_openwindow(struct fb_vtable_s *vtable);
+static int sim_closewindow(struct fb_vtable_s *vtable);
+
 /****************************************************************************
  * Private Data
  ****************************************************************************/
@@ -160,12 +165,47 @@ static struct fb_vtable_s g_fbobject =
   .getcursor     = sim_getcursor,
   .setcursor     = sim_setcursor,
 #endif
+
+  .open          = sim_openwindow,
+  .close         = sim_closewindow,
 };
 
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: sim_openwindow
+ ****************************************************************************/
+
+static int sim_openwindow(struct fb_vtable_s *vtable)
+{
+  int ret = OK;
+  ginfo("vtable=%p\n", vtable);
+
+#ifdef CONFIG_SIM_X11FB
+  ret = sim_x11openwindow();
+#endif
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: sim_closewindow
+ ****************************************************************************/
+
+static int sim_closewindow(struct fb_vtable_s *vtable)
+{
+  int ret = OK;
+  ginfo("vtable=%p\n", vtable);
+
+#ifdef CONFIG_SIM_X11FB
+  ret = sim_x11closewindow();
+#endif
+
+  return ret;
+}
+
 /****************************************************************************
  * Name: sim_getvideoinfo
  ****************************************************************************/
diff --git a/arch/sim/src/sim/sim_internal.h b/arch/sim/src/sim/sim_internal.h
index 67432a026a8..b858e568d65 100644
--- a/arch/sim/src/sim/sim_internal.h
+++ b/arch/sim/src/sim/sim_internal.h
@@ -242,6 +242,8 @@ int sim_x11initialize(unsigned short width, unsigned short height,
                       void **fbmem, size_t *fblen, unsigned char *bpp,
                       unsigned short *stride);
 int sim_x11update(void);
+int sim_x11openwindow(void);
+int sim_x11closewindow(void);
 #ifdef CONFIG_FB_CMAP
 int sim_x11cmap(unsigned short first, unsigned short len,
                 unsigned char *red, unsigned char *green,