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You can supplement the traditional wake-up packet method by using the wake-up proxy client settings. Wake-up proxy uses a peer-to-peer protocol and elected computers to check whether other computers on the subnet are awake, and to wake them if necessary. When the site is configured for Wake On LAN and clients are configured for wake-up proxy, the process works as follows:

Computers with the Configuration Manager client installed and that aren't asleep on the subnet check whether other computers on the subnet are awake. They do this check by sending each other a TCP/IP ping command every five seconds.

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Because it's possible that a computer might not respond because of a reason other than it's asleep (for example, it's turned off, removed from the network, or the proxy wake-up client setting is no longer applied), the computers are sent a wake-up packet every day at 2 P.M. local time. Computers that don't respond will no longer be assumed to be asleep and will not be woken up by wake-up proxy.

To support wake-up proxy, at least three computers must be awake for each subnet. To achieve this requirement, three computers are non-deterministically chosen to be guardian computers for the subnet. This state means that they stay awake, despite any configured power policy to sleep or hibernate after a period of inactivity. Guardian computers honor shutdown or restart commands, for example, as a result of maintenance tasks. If this action happens, the remaining guardian computers wake up another computer on the subnet so that the subnet continues to have three guardian computers.

During this process, the IP-to-MAC mapping for the sleeping computer remains the same. Wake-up proxy works by informing the network switch that a different network adapter is using the port that was registered by another network adapter. However, this behavior is known as a MAC flap and is unusual for standard network operation. Some network monitoring tools look for this behavior and can assume that something is wrong. Consequently, these monitoring tools can generate alerts or shut down ports when you use wake-up proxy.

When a manager computer sees a new TCP connection request for a sleeping computer and the request is to a port that the sleeping computer was listening on before it went to sleep, the manager computer sends a wake-up packet to the sleeping computer, and then stops redirecting traffic for this computer.

If you have a separate team that is responsible for the network infrastructure and network services, notify and include this team during your evaluation and testing period. For example, on a network that uses 802.1X network access control, wake-up proxy will not work and can disrupt the network service. In addition, wake-up proxy could cause some network monitoring tools to generate alerts when the tools detect the traffic to wake-up other computers.

Clients must be enabled for wake-up proxy by using client settings. Although wake-up proxy operation does not depend on hardware inventory, clients do not report the installation of the wake-up proxy service unless they are enabled for hardware inventory and submitted at least one hardware inventory.

Network adapters (and possibly the BIOS) must be enabled and configured for wake-up packets. If the network adapter is not configured for wake-up packets or this setting is disabled, Configuration Manager will automatically configure and enable it for a computer when it receives the client setting to enable wake-up proxy.

If a computer has more than one network adapter, you cannot configure which adapter to use for wake-up proxy; the choice is non-deterministic. However, the adapter chosen is recorded in the SleepAgent_@SYSTEM_0.log file.

Decide whether to use subnet-directed broadcast packets, or unicast packets, and what UDP port number to use. By default, traditional wake-up packets are transmitted by using UDP port 9, but to help increase security, you can select an alternative port for the site if this alternative port is supported by intervening routers and firewalls.

If you chose to wake up computers by sending traditional wake-up packets, you must decide whether to transmit unicast packets or subnet-direct broadcast packets. If you use wake-up proxy, you must use unicast packets. Otherwise, use the following table to help you determine which transmission method to choose.

Note: The wake word has been re-enabled in the latest version of Cortana in Windows. If you're on Windows 10, May 2020 Update, be sure that you've updated to build 19041.329 or later to use the wake word with Cortana. For earlier builds, you can still click on the microphone button to use your voice with Cortana.

This topic describes the types of wake sources that must be able to wake the processor. It also explains which wake events should turn the screen on and which wake events should allow the screen to stay turned off. System integrators should use this information to ensure that their hardware platforms, firmware, and software can configure wake sources to achieve the required behavior.

Enabling the Modern Standby user experience requires all of the devices and software in the Modern Standby PC to actively and correctly participate in system power management. Achieving long standby battery life is primarily a function of allowing all devices, plus the core silicon or System on a Chip (SoC), to enter a very low-power idle state. During Modern Standby, the networking subsystem stays connected so that the system can wake and instantly respond to incoming emails or VoIP calls. Enabling the real-time nature of Modern Standby is primarily a function of platform devices waking the SoC for the correct events at the correct times.

All wake sources in the Modern Standby PC are expected to be capable of waking the SoC from its deepest idle power state. Some wake sources should be capable of generating a wake signal for an event that would cause the system display to turn on. The difference between waking the SoC and turning on the display is central to delivering the Modern Standby user experience. The following rules govern platform wake behavior:

The remainder of this topic describes the different types of wake sources, along with additional information, such as whether the wake source can turn on a device's display, whether it is enabled by default, and any differences in operation depending on whether a device is on AC or DC power.

The core silicon or SoC chip in a Modern Standby platform has one or more timers that are always powered on that so that Windows can schedule future work and place the SoC into a deep idle state. During standby, the always-on timer reliably wakes the SoC as programmed by the OS.

The system power button is a very common user-initiated wake source in a Modern Standby platform. All Modern Standby PCs must be designed so that the power button is always enabled to send a wake interrupt to the SoC. To deliver an instant-on experience, the power button must cause the SoC to wake from the deepest idle state without delay. Another common user-initiated wake source on clamshell form factor devices is opening the lid, which wakes the SoC. The Windows button is also able to wake the SoC.

The Wi-Fi, Ethernet, and mobile broadband (MBB) devices are responsible for delivering the real-time and constant connectivity features of Modern Standby. They facilitate wake sources such as Universal Windows Platform (UWP) Applications notifications and syncing and Bluetooth notifications and syncing.

We recommend using HIDI2C for input peripherals whenever possible for better power efficiency, but this is not a requirement. If necessary, USB can be used to connect to an input device such as a touchpad, touch digitizer, or pen digitizer. We highly recommend that a precision touchpad be capable of waking the system from deep idle, regardless of whether this device is connected to USB, I2C, or SPI. Pen digitizers must not wake the system from deep idle.

In addition to buttons on the chassis, a Modern Standby PC might have other input devices physically integrated into the system or attached to the system directly or indirectly through a dock. When the user generates input through an input device, it must always wake the SoC from the deepest idle state and cause the display to turn on, unless the lid is closed and input suppression is engaged.

Starting in Windows 11, touch screens may also wake the system from deep idle or S3, however it is not required. OEMs, ODMs and system implementers should be conscious of the additional battery drain that a wake capable touch screen will have while the system is in its respective standby mode."

On systems that are Wake on Voice-capable and have a hardware keyword spotter (HW-KWS), voice input of "Hey Cortana" from the user can wake the SoC from the deepest idle state and cause the display to turn on. On systems with Multiple Voice Assistants (MVA) support with an MVA-capable driver, additional voice assistant commands can wake the SoC from the deepest idle state and cause the display to turn on.

Windows Update can always wake the SoC from the deepest idle state to scan for updates. It can also wake the SoC to download and install updates and restart a device, depending on a device's power source.

UWP applications can wake the SoC from the deepest idle state to sync and display notifications, depending on a device's power source, notification priority levels, and app-specific user configurations.

Remote Desktop and File Sharing can wake the SoC from the deepest idle state, depending on the target device's power source and networking connection. Remote Desktop can turn on the display on the target system.

For example, attaching a dock alone should not cause the SoC to wake. Instead, detection of new devices (IC device, battery, AC power source, and so on) contained in the dock should cause the SoC to wake.

Windows and its drivers are responsible for detecting the type of associated Bluetooth device. If a keyboard, mouse, or other user-input device is responsible for causing the Bluetooth radio to wake the SoC, the display will turn on. Other Bluetooth devices such as portable audio headphones will not cause the display to turn on. ff782bc1db