Before using any Xres extension one must call XResQueryExtension()

src/core/display.c

@@ -50,6 +50,7 @@
 #include "compositor.h"
 #include <X11/Xatom.h>
 #include <X11/cursorfont.h>
+#include <X11/extensions/XRes.h>
 
 #ifdef HAVE_SOLARIS_XINERAMA
 	#include <X11/extensions/xinerama.h>
@@ -329,7 +330,7 @@ meta_display_open (void)
   Display *xdisplay;
   GSList *screens;
   GSList *tmp;
-  int i;
+  int i, event_base, error_base;
   guint32 timestamp;
 
   /* A list of all atom names, so that we can intern them in one go. */
@@ -350,6 +351,9 @@ meta_display_open (void)
 		    XDisplayName (NULL));
       return FALSE;
     }
+  /* Make sure to init Xres any extensions */
+  if (!XResQueryExtension(xdisplay, &event_base, &error_base))
+      meta_verbose ("No XRes extensions.\n")
 
   if (meta_is_syncing ())
     XSynchronize (xdisplay, True);