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

*** 61,71 ****
      private static Boolean xrandrExtSupported;
      private final Object configLock = new Object();
      private SunDisplayChanger topLevels = new SunDisplayChanger();
      private DisplayMode origDisplayMode;
      private boolean shutdownHookRegistered;
!     private final int scale;
  
      public X11GraphicsDevice(int screennum) {
          this.screen = screennum;
          this.scale = initScaleFactor();
      }
--- 61,71 ----
      private static Boolean xrandrExtSupported;
      private final Object configLock = new Object();
      private SunDisplayChanger topLevels = new SunDisplayChanger();
      private DisplayMode origDisplayMode;
      private boolean shutdownHookRegistered;
!     private int scale;
  
      public X11GraphicsDevice(int screennum) {
          this.screen = screennum;
          this.scale = initScaleFactor();
      }
*** 486,495 ****
--- 486,498 ----
      /**
       * From the DisplayChangedListener interface; called from
       * X11GraphicsEnvironment when the display mode has been changed.
       */
      public synchronized void displayChanged() {
+         if (SunGraphicsEnvironment.isUIScaleEnabled()) {
+             scale = initScaleFactor();
+         }
          // On X11 the visuals do not change, and therefore we don't need
          // to reset the defaultConfig, config, doubleBufferVisuals,
          // neither do we need to reset the native data.
  
          // pass on to all top-level windows on this screen