The "Wake on LAN" (WOL) feature wakes a computer from a low-power state when a network adapter detects a WOL event. Typically, such an event is a specially constructed Ethernet packet. The default behavior in response to WOL events has changed from Windows 7 to Windows 8 and Windows 10.
In Windows 7, the default shutdown operation puts the system into the classic shutdown state (S5), and all devices are put into the lowest power state (D3). WOL from S5 is not officially supported in Windows 7. However, some network adapters can be left armed for waking if enough residual power is available. Therefore, waking from S5 is possible on some systems if enough residual power is supplied to the network adapter even though the system is in the S5 state and devices are in D3.
Windows 8, Windows 8.1 and Windows 10
In Windows 8, 8.1 and Windows 10, the default shutdown behavior puts the system into the hybrid shutdown (also known as Fast Startup) state (S4), and all devices are put into D3. In this scenario, WOL from S4 or S5 is unsupported. Network adapters are explicitly not armed for WOL in these cases because users expect zero power consumption and battery drain in the shutdown state. This behavior removes the possibility of invalid wake-ups when an explicit shutdown is requested. Therefore, WOL is supported only from sleep (S3), or when the user explicitly requests to enter hibernate (S4) state in Windows 8, 8.1 and Windows 10. Although the target system power state is the same between hybrid shutdown and hibernate (S4), Windows will only explicitly disable WOL when it's a hybrid shutdown transition, and not during a hibernate transition.
Note the firmware and hardware on some systems may support arming Network Interface Cards (NICs) for wake from S4 or S5, even though Windows isn't involved in the process.
To disable the S4 state in Windows 8, 8.1 and Windows 10, follow these steps.
Note We do not recommend that you disable the hybrid shutdown (S4) state.
- In Control Panel, open the Power Options item.
- Click the Choose what the power buttons do link.
- Clear the Turn on fast startup (recommended) check box.
- Click Save Settings.