SystemEvents.PowerModeChanged not fireing if computer is put to sleep over start menu

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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[severity:It bothers me. A fix would be nice]
I am using the following code in my application:

SystemEvents.PowerModeChanged += new PowerModeChangedEventHandler(OnPoweModerChange);

static void OnPoweModerChange(object s, PowerModeChangedEventArgs e)
        {
            SimpleLog.Info("OnPoweModerChange");
            if (e.Mode == PowerModes.Suspend)
            {
                SimpleLog.Info("Suspend");
            }
            else if (e.Mode == PowerModes.Resume)
            {
                SimpleLog.Info("Resume");
            }
            else
            {
                try
                {
                    SimpleLog.Info(e.Mode.ToString());
                }
                catch (Exception ex)
                {
                    SimpleLog.Warning(ex.ToString());
                }
            }
        }

It should tell weather the system has been suspended or not. However this is only the case if the system goes to sleep by itself. This can be set in the system settings.

If I put the system to sleep manually. The PowerModeChanged event is not fired at all.

Is there another Function to catch that or is this an error in windows?

I do not remember it being the case with windows 10.
It is definitely a Problem on Windows 11!

---

Original Comments

Feedback Bot on 10/28/2022, 04:40 AM:

(private comment, text removed)

---

Original Solutions

(no solutions)

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Tagging subscribers to this area: @dotnet/area-microsoft-win32
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Issue Details

---

This issue has been moved from a ticket on Developer Community.

---

[severity:It bothers me. A fix would be nice]
I am using the following code in my application:

SystemEvents.PowerModeChanged += new PowerModeChangedEventHandler(OnPoweModerChange);

static void OnPoweModerChange(object s, PowerModeChangedEventArgs e)
        {
            SimpleLog.Info("OnPoweModerChange");
            if (e.Mode == PowerModes.Suspend)
            {
                SimpleLog.Info("Suspend");
            }
            else if (e.Mode == PowerModes.Resume)
            {
                SimpleLog.Info("Resume");
            }
            else
            {
                try
                {
                    SimpleLog.Info(e.Mode.ToString());
                }
                catch (Exception ex)
                {
                    SimpleLog.Warning(ex.ToString());
                }
            }
        }

It should tell weather the system has been suspended or not. However this is only the case if the system goes to sleep by itself. This can be set in the system settings.

If I put the system to sleep manually. The PowerModeChanged event is not fired at all.

Is there another Function to catch that or is this an error in windows?

I do not remember it being the case with windows 10.
It is definitely a Problem on Windows 11!

---

Original Comments

Feedback Bot on 10/28/2022, 04:40 AM:

(private comment, text removed)

---

Original Solutions

(no solutions)

Author:	vsfeedback
Assignees:	-
Labels:	area-Microsoft.Win32, untriaged
Milestone:	-

[carlossanlop]

Mislav Boras (original submitter in VS Feedback) hopefully you see this message: what .NET version did you use to test this?

[carlossanlop]

I wrote a small test console app and was able to repro with .NET 6 and .NET 8 in Windows 11:

• The PowerMode.Resume and PowerModes.Suspend do not get triggered after putting the computer to sleep and waking it up again.
• But if I disconnect the battery charger, the PowerMode.StatusChange event triggers and gets correctly read by the registered PowerModeChangedEventHandler, meaning our code is doing the right thing.

Here's the app:

using Microsoft.Win32;
using System;

namespace ConsoleApp;

public class Program
{
    public static void Main()
    {
        SystemEvents.PowerModeChanged += new PowerModeChangedEventHandler(OnPowerModeChange);
        Console.WriteLine("Running...");
        Console.ReadLine();
    }

    private static void OnPowerModeChange(object s, PowerModeChangedEventArgs e)
    {
        Log("OnPowerModeChange");
        try
        {
            Log(e.Mode.ToString());
            
        }
        catch (Exception ex)
        {
            Log($"Exception: {ex.Message}\n" + $"Stacktrace:\n{ex.StackTrace}\n\n");
        }
    }

    private static void Log(string content) => Console.WriteLine($"{DateTime.Now} : {content}");
}

Our unit tests pass by manually registering the Windows messages and detecting them in these APIs:

runtime/src/libraries/Microsoft.Win32.SystemEvents/tests/SystemEvents.PowerMode.cs

Lines 17 to 49 in d4d0812

	[ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWindowsNanoNorServerCore))]
	[InlineData(User32.PBT_APMBATTERYLOW, PowerModes.StatusChange)]
	[InlineData(User32.PBT_APMOEMEVENT, PowerModes.StatusChange)]
	[InlineData(User32.PBT_APMPOWERSTATUSCHANGE, PowerModes.StatusChange)]
	[InlineData(User32.PBT_APMRESUMECRITICAL, PowerModes.Resume)]
	[InlineData(User32.PBT_APMRESUMESUSPEND, PowerModes.Resume)]
	[InlineData(User32.PBT_APMRESUMESTANDBY, PowerModes.Resume)]
	[InlineData(User32.PBT_APMSUSPEND, PowerModes.Suspend)]
	[InlineData(User32.PBT_APMSTANDBY, PowerModes.Suspend)]
	public void SignalsPowerModeChanged(int pmEvent, PowerModes powerMode)
	{
	bool changed = false;
	PowerModeChangedEventArgs args = null;
	PowerModeChangedEventHandler changedHandler = (o, e) =>
	{
	changed = true;
	args = e;
	};
	SystemEvents.PowerModeChanged += changedHandler;
	try
	{
	SendMessage(pmEvent);
	Assert.True(changed);
	Assert.NotNull(args);
	Assert.Equal(powerMode, args.Mode);
	}
	finally
	{
	SystemEvents.PowerModeChanged -= changedHandler;
	}
	}

So this looks a lot like a Windows 11 issue.