--- old/src/solaris/classes/sun/awt/X11/XWM.java	2012-04-08 17:42:16.106554314 -0400
+++ new/src/solaris/classes/sun/awt/X11/XWM.java	2012-04-08 17:42:15.905552373 -0400
@@ -102,7 +102,8 @@
         METACITY_WM = 11,
         COMPIZ_WM = 12,
         LG3D_WM = 13,
-        CWM_WM = 14;
+        CWM_WM = 14,
+        MUTTER_WM = 15;
     public String toString() {
         switch  (WMID) {
           case NO_WM:
@@ -131,6 +132,8 @@
               return "LookingGlass";
           case CWM_WM:
               return "CWM";
+          case MUTTER_WM:
+              return "Mutter";
           case UNDETERMINED_WM:
           default:
               return "Undetermined WM";
@@ -573,6 +576,10 @@
 //                            getIntProperty(XToolkit.getDefaultRootWindow(), XAtom.XA_CARDINAL)) == 0);
     }
 
+    static boolean isMutter() {
+        return isNetWMName("Mutter");
+    }
+
     static boolean isNonReparentingWM() {
         return (XWM.getWMID() == XWM.COMPIZ_WM || XWM.getWMID() == XWM.LG3D_WM || XWM.getWMID() == XWM.CWM_WM);
     }
@@ -742,6 +749,8 @@
                 awt_wmgr = XWM.ENLIGHTEN_WM;
             } else if (isMetacity()) {
                 awt_wmgr = XWM.METACITY_WM;
+            } else if (isMutter()) {
+                awt_wmgr = XWM.MUTTER_WM;
             } else if (isSawfish()) {
                 awt_wmgr = XWM.SAWFISH_WM;
             } else if (isKDE2()) {