Freeze on resume from standby (1 Viewer)

[mba]

Hi

First of all thanks a bundle for the new release, beside the problem described below it is rock-stable on my setup!

TV-Server Version: 1.0
MediaPortal Version: 1.0
MediaPortal Skin: Indigo 2.4 / Blue3 Wide
Windows Version: Windows XP Home

I have observed that MP freezes occasionally when resuming from standby. This happens 2-3 times a day either when I turn on the system by remote or when MP starts automatically for recording something. I had the problem on both RC4 and now on MP 1.0 and at first I thought it was related to https://forum.team-mediaportal.com/1-0-rc4-svn-builds-299/mp-crashed-vc-runtime-error-49234/ where people was getting a "pure virtual" error.

Looking in the logs it seems that MP calls set_BlankScreen() and throws "Object reference not set to an instance of an object."

A section from the attached log where the error first happens:

2009-01-04 18:07:50.213968 [Info.][MPMain]: Main: Windows has resumed from hibernate mode
2009-01-04 18:07:51.335580 [Info.][MPMain]: Exception ystem.NullReferenceException: Object reference not set to an instance of an object.
at MediaPortal.GUI.Library.GUIGraphicsContext.set_BlankScreen(Boolean value)
at MediaPortal.GUI.Library.GUIGraphicsContext.ResetLastActivity()
at MediaPortalApp.OnResume()
at MediaPortalApp.WndProc(Message& msg)


Has anybody seens this behavior?

Best regards
Martin

 

[seco]

Try this workaround discussed here https://forum.team-mediaportal.com/general-support-51/mp-hangs-when-getting-out-standby-50788/

 

[mba]

thanks for the input seco but my logs indicates a completely different problem, I read some of the logs attached to the thread you refer to but they doesn't seem show the same error message.

 

[rtv]

    public static bool BlankScreen
    {
      get { return blankScreen; }
      set
      {
        if (value != blankScreen)
        {
          if (turnOffMonitor)
          {
            if (value)
              SendMessage(Form.ActiveForm.Handle, WM_SYSCOMMAND, SC_MONITORPOWER, (IntPtr)MONITOR_OFF);
            else
              SendMessage(Form.ActiveForm.Handle, WM_SYSCOMMAND, SC_MONITORPOWER, (IntPtr)MONITOR_ON);
          }

          blankScreen = value;
          if (OnVideoWindowChanged != null)
            OnVideoWindowChanged();
        }
      }
    }

Most likely in your case there's no Form handle available right after standby.

Please try if unchecking that general option to turn the display off completely cures your issue.

 

[mba]

thanks rtv -

that sounds very plausible when looking at the code. I have now removed the checkmark in the configuration.
I downloaded MP source from SF earlier today but I wasn't able to grep the BlankScreen function, where is this located?
What is the reason why the form object is unavailable just after resuming from standby? Is this a normal C#/.net situation or is there something wrong with my setup?

best regards
Martin

 

[markius]

rtv

I've done some testing here as I get the same problem.

The configuration option that causes the problem is "Turn monitor / tv on when resuming from standby". If this option is enabled, the freeze occurs.


In my environment I don't see any use for that option... when the PC resumes from hibernation the monitor is already on. Maybe other systems behave differently?

Mark

 

[ketjap]

When I wake up my system MP also hangs. This occurs probably when MP did a wakekup earlier when the display was turned off to grap EPG data etc. I will now try to turn off the option "Turn monitor / tv on when resuming from standby". My logs are attached.

 

[rtv]

I've added a possible fix which will be in the upcoming 1.01 update.

 

[ketjap]

So far so good. The option "Turn monitor / tv on when resuming from standby" seems to work for me.

 

[ketjap]

Didn't work

rtv, is this possible fix in the weekly testbuild of this week?