Show 'Unsupported' in config dialog for monitors without input options

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

DellMonitorControl/ConfigWindow.xaml.cs

@@ -34,6 +34,22 @@ public partial class ConfigWindow : Window
         spPorts.Children.Clear();
         _portRows.Clear();
 
+        // Show unsupported message if no ports available
+        if (_availablePorts == null || _availablePorts.Count == 0)
+        {
+            spPorts.Children.Add(new TextBlock
+            {
+                Text = "Unsupported",
+                Foreground = Brushes.Gray,
+                FontSize = 16,
+                FontStyle = FontStyles.Italic,
+                HorizontalAlignment = HorizontalAlignment.Center,
+                VerticalAlignment = VerticalAlignment.Center,
+                Margin = new Thickness(0, 40, 0, 40)
+            });
+            return;
+        }
+
         foreach (var port in _availablePorts)
         {
             var existingPortConfig = config.Ports.FirstOrDefault(p => p.VcpValue == port.Value);

DellMonitorControl/DellMonitorControl.csproj

@@ -13,9 +13,9 @@
 	</PropertyGroup>
 
 	<PropertyGroup>
-		<Version>1.0.14</Version>
-		<AssemblyVersion>1.0.14.0</AssemblyVersion>
-		<FileVersion>1.0.14.0</FileVersion>
+		<Version>1.0.16</Version>
+		<AssemblyVersion>1.0.16.0</AssemblyVersion>
+		<FileVersion>1.0.16.0</FileVersion>
 	</PropertyGroup>
 
 	<ItemGroup>

Library/Method/CMMCommand.cs

@@ -30,26 +30,32 @@ public static class CMMCommand
         return ConsoleHelper.CmdCommandAsync($"{CMMexe} /SetValue {monitorSN} D6 4");
     }
 
-    private static async Task<string> GetMonitorValue(string monitorSN, string vcpCode = "D6", int? reTry = 0)
+    private static async Task<string> GetMonitorValue(string monitorSN, string vcpCode = "D6", int maxRetries = 2)
     {
-        var value = string.Empty;
-        while (reTry <= 5)
+        for (int attempt = 0; attempt <= maxRetries; attempt++)
         {
             var cmdFileName = Path.Combine(CMMTmpFolder, $"{Guid.NewGuid()}.bat");
             var cmd = $"{CMMexe} /GetValue {monitorSN} {vcpCode}\r\n" +
                       $"echo %errorlevel%";
             File.WriteAllText(cmdFileName, cmd);
             var values = await ConsoleHelper.ExecuteCommand(cmdFileName);
-            File.Delete(cmdFileName);
+            try { File.Delete(cmdFileName); } catch { }
 
-            value = values.Split("\r\n", StringSplitOptions.RemoveEmptyEntries).LastOrDefault();
+            // Empty result means timeout - don't retry, monitor is unresponsive
+            if (string.IsNullOrEmpty(values))
+                return string.Empty;
 
-            if (!string.IsNullOrEmpty(value) && value != "0") return value;
-            await Task.Delay(500);
-            await GetMonitorValue(monitorSN, vcpCode, reTry++);
-        };
+            var value = values.Split("\r\n", StringSplitOptions.RemoveEmptyEntries).LastOrDefault();
 
-        return value;
+            if (!string.IsNullOrEmpty(value) && value != "0")
+                return value;
+
+            // Only retry on non-timeout failures
+            if (attempt < maxRetries)
+                await Task.Delay(300);
+        }
+
+        return string.Empty;
     }
 
     #region Brightness (VCP Code 10)