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Event ID 506: The system is entering Modern Standby

Windows Event ID Lookup: What Windows event IDs mean: 4625, 4624, 4740, 6008, 41, 7045, 1102 and 3,000 more, with Windows' own message text, the fields and what to check.

Look up a Windows event ID from Event Viewer, a SIEM alert or a log export: what it means, the fields it records, and what to check. Many IDs are used by more than one source (event 41 is both a Kernel-Power crash and a boot error), so every definition is shown, the one people usually mean first. The message text is Windows' own, read from the event providers of Windows 10.0.26200.0, 2026-10-28; the notes are ours, based on Microsoft's security auditing reference.

Try: 4625, 4624, 4740, 6008, 41, 1074, 7045, 1102, 4104, 1149

The system is entering Modern Standby

Event 506
Kernel-Power
System log
Information
Message and fields (as Event Viewer shows them) 
The system is entering Modern Standby 

Reason: ….

QoS summary for Storport Device (Port = …, Path = …, Target = …, Lun = …) whose Corresponding Class Disk Device Guid is …:

Event 506
StorPort
System log
Information
Message and fields (as Event Viewer shows them) 
QoS summary for Storport Device (Port = …, Path = …, Target = …, Lun = …) whose Corresponding Class Disk Device Guid is …:                    
Number of QoS requests that exceeded … seconds is … in this period.                    
SW timeout count for Unit and Adapter queues were … and … respectively during this period.                    
Max Depth of Unit and Adapter queues at the time of SW timeout were … and … respectively.                    
HwTimeout count was … in this period.

Explicit execution of all idle tasks has been requested.

Event 506
TaskScheduler
TaskScheduler/Operational log
Information
Message and fields (as Event Viewer shows them) 
Explicit execution of all idle tasks has been requested.