Add debug logging for dropdown selection and power unsupported state

- Added detailed logging in CreateInputRow to help diagnose dropdown
  selection issues after config label changes
- Power button now shows "Power Unsupported" and is disabled for
  monitors that don't support DDC/CI power control

🤖 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>1.0.17</Version>
+		<AssemblyVersion>1.0.17.0</AssemblyVersion>
+		<FileVersion>1.0.17.0</FileVersion>
 	</PropertyGroup>
 
 	<ItemGroup>

DellMonitorControl/MainWindow.xaml.cs

@@ -371,6 +371,10 @@ public partial class MainWindow : Window
 
     private StackPanel CreateInputRow(int? currentInput, List<InputSourceOption> options, string serialNumber)
     {
+        DebugLogger.Log($"  CreateInputRow: currentInput={currentInput}, optionCount={options.Count}");
+        foreach (var opt in options)
+            DebugLogger.Log($"    Option: Value={opt.Value}, Name={opt.Name}");
+
         var row = new StackPanel { Orientation = Orientation.Horizontal, Margin = new Thickness(0, 3, 0, 3) };
         row.Children.Add(new TextBlock { Text = "Input", Foreground = Brushes.LightGray, Width = 70, FontSize = 12, VerticalAlignment = VerticalAlignment.Center });
 
@@ -390,9 +394,14 @@ public partial class MainWindow : Window
         if (currentInput.HasValue)
         {
             var index = options.FindIndex(o => o.Value == currentInput.Value);
+            DebugLogger.Log($"    Selection: Looking for Value={currentInput.Value}, found at index={index}");
             if (index >= 0)
                 combo.SelectedIndex = index;
         }
+        else
+        {
+            DebugLogger.Log($"    Selection: currentInput is null, no selection");
+        }
 
         // Add event handler AFTER setting the initial selection
         combo.SelectionChanged += async (s, e) =>
@@ -410,26 +419,33 @@ public partial class MainWindow : Window
         var row = new StackPanel { Orientation = Orientation.Horizontal, Margin = new Thickness(0, 3, 0, 3) };
         row.Children.Add(new TextBlock { Text = "Power", Foreground = Brushes.LightGray, Width = 70, FontSize = 12, VerticalAlignment = VerticalAlignment.Center });
 
+        var isUnsupported = string.IsNullOrEmpty(status) || status == "Unknown";
+
         var btn = new Button
         {
-            Content = status,
+            Content = isUnsupported ? "Power Unsupported" : status,
             Width = 170,
             Tag = serialNumber,
-            Style = (Style)FindResource("DarkButton")
+            Style = (Style)FindResource("DarkButton"),
+            IsEnabled = !isUnsupported
         };
-        btn.Click += async (s, e) =>
+
+        if (!isUnsupported)
         {
-            if (s is Button b && b.Tag is string sn)
+            btn.Click += async (s, e) =>
             {
-                var current = await CMMCommand.GetMonPowerStatus(sn);
-                if (current == "Sleep" || current == "PowerOff")
-                    await CMMCommand.PowerOn(sn);
-                else
-                    await CMMCommand.Sleep(sn);
-                await Task.Delay(1000);
-                b.Content = await CMMCommand.GetMonPowerStatus(sn);
-            }
-        };
+                if (s is Button b && b.Tag is string sn)
+                {
+                    var current = await CMMCommand.GetMonPowerStatus(sn);
+                    if (current == "Sleep" || current == "PowerOff")
+                        await CMMCommand.PowerOn(sn);
+                    else
+                        await CMMCommand.Sleep(sn);
+                    await Task.Delay(1000);
+                    b.Content = await CMMCommand.GetMonPowerStatus(sn);
+                }
+            };
+        }
 
         row.Children.Add(btn);
         return row;

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)