Connected Standby Power State Registry Key

Connected Standby, now commonly referred to as Modern Standby (S0 Low Power Idle), allows Windows systems to manage background activity and maintain network connectivity while in a low-power state. Tracking and managing how the operating system transitions between active, idle, and sleep states is handled directly within the Windows Registry. This article identifies the exact registry location storing active power state transitions and configuration settings for Connected Standby, detailing how to locate and interpret these parameters.

The Registry Key Location

The primary registry path responsible for storing power state transitions, active power configurations, and Modern Standby behavior in Windows is:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power

Within this key, Windows maintains active state transitions, power schemes, and operational modes for sleep and idle states.

Key Subkeys for Connected Standby Transitions

To inspect specific transitions and telemetry related to Connected Standby, navigate to the following subkeys under the main Power path:

• ...\Control\Power\SleepStudy This key stores telemetry and detailed transition state histories for Modern Standby sessions. It tracks entry reasons, exit reasons, active components preventing deep sleep, and state duration metrics.

• ...\Control\Power\PowerSettings Contains GUID-based definitions that govern how the system transitions between operational power states, processor performance states, and sleep tiers.

• ...\Control\Power\ModernSleep Present on newer Windows builds to store specific Modern Standby configuration profiles and operational constraints.

How to Access the Key in Regedit

1. Press Win + R, type regedit, and press Enter.
2. Paste the following path into the address bar at the top: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power
3. Expand the Power key to view associated subkeys such as SleepStudy and PowerSettings.

Alternative Diagnostic Method

While the registry stores raw configuration and transition data, the most readable diagnostic output for active Connected Standby transitions is generated via the Windows Command Prompt. Running powercfg /sleepstudy outputs a detailed HTML report based directly on the transition records stored under the Power registry key.