Add PowerModeChanged event handler to reset the hardware tree when resuming from sleep

Based on the work of @moellerm

LibreHardwareMonitor/UI/MainForm.cs

@@ -123,7 +123,7 @@ namespace LibreHardwareMonitor.UI
             _systemTray.ExitCommand += ExitClick;
 
             if (Software.OperatingSystem.IsUnix)
-            { 
+            {
                 // Unix
                 treeView.RowHeight = Math.Max(treeView.RowHeight, 18);
                 splitContainer.BorderStyle = BorderStyle.None;
@@ -355,7 +355,9 @@ namespace LibreHardwareMonitor.UI
                 }
             }
             else
+            {
                 Show();
+            }
 
             // Create a handle, otherwise calling Close() does not fire FormClosed
 
@@ -367,6 +369,17 @@ namespace LibreHardwareMonitor.UI
                 if (_runWebServer.Value)
                     Server.Quit();
             };
+
+            Microsoft.Win32.SystemEvents.PowerModeChanged += PowerModeChanged;
+        }
+
+        private void PowerModeChanged(object sender, Microsoft.Win32.PowerModeChangedEventArgs eventArgs)
+        {
+
+            if (eventArgs.Mode == Microsoft.Win32.PowerModes.Resume)
+            {
+                _computer.Reset();
+            }
         }
 
         private void InitializeSplitter()

LibreHardwareMonitorLib/Hardware/Computer.cs

@@ -25,8 +25,8 @@ namespace LibreHardwareMonitor.Hardware
     {
         private readonly List<IGroup> _groups = new List<IGroup>();
         private readonly ISettings _settings;
-        private bool _cpuEnabled;
         private bool _controllerEnabled;
+        private bool _cpuEnabled;
         private bool _gpuEnabled;
         private bool _memoryEnabled;
         private bool _motherboardEnabled;
@@ -359,6 +359,13 @@ namespace LibreHardwareMonitor.Hardware
             Ring0.Open();
             OpCode.Open();
 
+            AddGroups();
+
+            _open = true;
+        }
+
+        private void AddGroups()
+        {
             if (_motherboardEnabled)
                 Add(new MotherboardGroup(_smbios, _settings));
 
@@ -387,8 +394,6 @@ namespace LibreHardwareMonitor.Hardware
 
             if (_networkEnabled)
                 Add(new NetworkGroup(_settings));
-
-            _open = true;
         }
 
         private static void NewSection(TextWriter writer)
@@ -481,6 +486,25 @@ namespace LibreHardwareMonitor.Hardware
             _open = false;
         }
 
+        public void Reset()
+        {
+            if (!_open)
+                return;
+
+
+            RemoveGroups();
+            AddGroups();
+        }
+
+        private void RemoveGroups()
+        {
+            while (_groups.Count > 0)
+            {
+                IGroup group = _groups[_groups.Count - 1];
+                Remove(group);
+            }
+        }
+
         private class Settings : ISettings
         {
             public bool Contains(string name)