8354415: [Ubuntu25.04] api/java_awt/GraphicsDevice/indexTGF.html#SetDisplayMode - setDisplayMode_REFRESH_RATE_UNKNOWN fails: Height is different on vnc

Backport-of: 18c2e40de75f974858aeb453892e4c7c8d5aa90e

Author: Alexander Zvegintsev

src/java.desktop/unix/classes/sun/awt/X11GraphicsDevice.java

@@ -333,7 +333,7 @@ depth, getConfigColormap(0, screen),
 
     private static native void enterFullScreenExclusive(long window);
     private static native void exitFullScreenExclusive(long window);
-    private static native boolean initXrandrExtension();
+    private static native boolean initXrandrExtension(boolean useOldConfigDisplayMode);
     private static native DisplayMode getCurrentDisplayMode(int screen);
     private static native void enumDisplayModes(int screen,
                                                 ArrayList<DisplayMode> modes);
@@ -350,10 +350,11 @@ private static native void configDisplayMode(int screen,
      */
     private static synchronized boolean isXrandrExtensionSupported() {
         if (xrandrExtSupported == null) {
-            xrandrExtSupported =
-                Boolean.valueOf(initXrandrExtension());
+            boolean useOldConfigDisplayMode =
+                    Boolean.getBoolean("awt.x11useOldConfigDisplayMode");
+            xrandrExtSupported = initXrandrExtension(useOldConfigDisplayMode);
         }
-        return xrandrExtSupported.booleanValue();
+        return xrandrExtSupported;
     }
 
     @Override

src/java.desktop/unix/native/common/awt/awt_GraphicsEnv.h

@@ -62,4 +62,11 @@ struct X11GraphicsConfigIDs {
     jfieldID bitsPerPixel;
 };
 
+#define MAX_DISPLAY_MODES 256
+typedef struct {
+    unsigned int width;
+    unsigned int height;
+    jint refresh;
+} DisplayMode;
+
 #endif /* _AWT_GRAPHICSENV_H_ */