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[Notebook] Why does the system still enter sleep mode after setting it to never sleep when the screen is closed?
If your computer is set to never enter sleep mode, but the power options are configured to turn off the screen after a few minutes, it may still enter sleep mode when the screen is closed. (The left image below is for Windows 11 settings; the right is for Windows 10 settings.)
- First, ensure that your computer is running Windows 11/10 and supports Modern Standby. Learn more about How to check whether my device supports Modern Standby mode.
- If your computer supports Modern Standby, this behavior is normal. Due to Microsoft's native design, Modern Standby was introduced starting from Windows 10. When the screen is closed, Modern Standby is immediately activated, and the system enters a quick sleep.
Modern Standby vs S3 (Sleep)
In Windows 10, there are two power models for PCs: S3 and Modern Standby. The S3 power model is an older standard and is not capable of the instant on that consumers expect from modern devices. Modern Standby is capable of leveraging all the capabilities of a modern chipset and can be integrated across the breadth of tablets and PCs today. The first iteration of Modern Standby was Connected Standby, which first shipped in Windows 8 and Windows 8.1. Modern Standby expands upon the Windows 8.x Connected Standby concept, allowing for flexibility in component selection and the ability for the OS to manage network connectivity in standby.
The above figure illustrates the relationships between the models and how Modern Standby systems can either stay connected to or disconnect from the network while in standby.
On any Modern Standby system, the system remains in S0 while in standby, allowing the following scenarios to work:
- Background activity
- Faster resume from a low power state
On systems that can stay connected while in standby, wakes based on specific network patterns may also be set by the operating system to enable apps to receive the latest content such as incoming email, VoIP calls, or news articles.
Technical differences
When in the lowest power state, systems may look very similar to systems in the S3 state—processors are powered off and memory is in self-refresh. The difference is in the path of how it enters and exits low power state. For S3 systems, the system is either active or in S3. For Modern Standby, the transition from the active to the low power state is a series of steps to lower power consumption. Components are powered down when they are not in use. So, the transition into and out of a lower power state is much quicker on a Modern Standby system than on an S3 system. This design also helps with the speed of entry and exit from Standby as it doesn’t require firmware interactions.
The above content is sourced from Microsoft's documentation.
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