[This documentation is preliminary and is subject to change.]
Starting with Windows 8, PCs that implement the connected standby power model run at very low power levels, but stay connected and up-to-date, even when they appear to the user to be turned off.
Starting with Windows 8 and Windows 8.1, the connected standby power model enables Windows PCs to provide an instant-on, always-connected experience, similar to that of smartphone devices. The underlying power-management technologies that support connected standby are dramatically different from the traditional ACPI Sleep (S3) and Hibernate (S4) states.
This section describes the user experience requirements for the power and battery charging subsystem in a hardware platform that runs Windows. It provides detailed implementation guidance for platform designers and firmware developers. They can use this information to ensure their platforms are compatible with Windows power management software.
The connected standby power model is implemented by designers of battery-powered hardware platforms that run Windows.
Build date: 11/16/2013