diff --git a/distro/etc_nixos/overlays/desktop/default.nix b/distro/etc_nixos/overlays/desktop/default.nix
index 231704022..3478a05ec 100644
--- a/distro/etc_nixos/overlays/desktop/default.nix
+++ b/distro/etc_nixos/overlays/desktop/default.nix
@@ -45,8 +45,12 @@ self: super:
   xfce = super.xfce // {
     xfwm4 = super.xfce.xfwm4.overrideAttrs (oldAttrs: { version = "4.16.1"; });
 
-    xfdesktop =
-      super.xfce.xfdesktop.overrideAttrs (oldAttrs: { version = "4.16.0"; });
+    xfdesktop = super.xfce.xfdesktop.overrideAttrs (oldAttrs: {
+      version = "4.16.0";
+      patches = (oldAttrs.patches or [ ]) ++ [
+        ./patches/xfdesktop4/0001-Fix-not-using-consistent-monitor-identifiers.patch
+      ];
+    });
   };
 }
 
diff --git a/distro/etc_nixos/overlays/desktop/patches/xfdesktop4/0001-Fix-not-using-consistent-monitor-identifiers.patch b/distro/etc_nixos/overlays/desktop/patches/xfdesktop4/0001-Fix-not-using-consistent-monitor-identifiers.patch
new file mode 100644
index 000000000..fbe10f99b
--- /dev/null
+++ b/distro/etc_nixos/overlays/desktop/patches/xfdesktop4/0001-Fix-not-using-consistent-monitor-identifiers.patch
@@ -0,0 +1,49 @@
+From 7910c57b0862ab8b81af895d9aaddaadbe3109d9 Mon Sep 17 00:00:00 2001
+From: Wei Zhang <ruoyuan.zw@antgroup.com>
+Date: Thu, 28 Aug 2025 16:58:42 +0800
+Subject: [PATCH] Fix not using consistent monitor identifiers
+
+The settings dialog was using gdk_monitor_get_model() which often returns
+NULL, causing it to generate invalid property paths. The main daemon uses
+connector names via xfw_monitor_get_connector(). This mismatch prevented
+wallpaper changes from taking effect.
+
+Changed settings dialog to use gdk_monitor_get_model() with a fallback to
+"default" when NULL, ensuring both processes use compatible monitor
+identifiers for XfConf property paths.
+
+Signed-off-by: Wei Zhang <ruoyuan.zw@antgroup.com>
+---
+ common/xfdesktop-common.c | 11 ++++++++++-
+ 1 file changed, 10 insertions(+), 1 deletion(-)
+
+diff --git a/common/xfdesktop-common.c b/common/xfdesktop-common.c
+index c846c05..101025d 100644
+--- a/common/xfdesktop-common.c
++++ b/common/xfdesktop-common.c
+@@ -114,12 +114,21 @@ xfdesktop_get_monitor_name_from_gtk_widget(GtkWidget *widget, gint monitor_num)
+     GdkWindow     *window = NULL;
+     GdkDisplay    *display = NULL;
+     GdkMonitor    *monitor = NULL;
++    const gchar   *model = NULL;
+
+     window = gtk_widget_get_window(widget);
+     display = gdk_window_get_display(window);
+     monitor = gdk_display_get_monitor(display, monitor_num);
+
+-    return g_strdup(gdk_monitor_get_model(monitor));
++    // Get monitor model name (this is what GDK provides)
++    model = gdk_monitor_get_model(monitor);
++
++    // For consistency, if model is NULL, fall back to a default identifier
++    if (model == NULL || strlen(model) == 0) {
++        return g_strdup("default");
++    }
++
++    return g_strdup(model);
+ }
+
+ gint
+--
+2.43.0
+