By akademiotoelektronik, 16/03/2023

What is the USB selective suspension function?How to activate or deactivate it?

Windows 11/10 has received many useful features.These published features are both based on consumers and developers.In addition to that, they did not fail to improvise the old features.One of these characteristics is a function of selective USB suspension.

What is the selective USB functionality suspended in Windows?

In the Windows operating system, the selective suspension function allows the system to save energy by putting certain USB ports in suspended mode.It allows the pilot of the concentrator to suspend a single port but does not affect the operation of the other ports.For example, this is similar to how users put their laptops or other devices in standby mode - the selective suspension is almost like that.The characteristic that makes it so interesting is that it can suspend a specific USB port, without affecting the power of the entire USB port.However, the driver of the USB device must support the selective suspension to work properly.

The USB Core Stack supports a modified revision of the Universal Serial Bus specification and is called "selective suspension".This allows the pilot of the concentrator to suspend a port and to help save the battery.The suspension of services such as the fingerprint reader, etc.., which are not required all the time, helps improve energy consumption.The behavior of this feature is different for devices operating under Windows XP and continues to improve in Windows Vista and subsequent versions.

Users don't really need it on a system that is already in charge and can take advantage of the plug -in power whenever they need it.This is why Windows allows users to activate the USB selective suspension depending on the computer plug-in or battery.But the selective suspension function is not exactly a requirement on a desktop machine connected to the sector.When a USB port is off, it does not necessarily save as much energy on a desktop computer.This is why Windows allows you to activate or deactivate the selective USB suspension depending on the connected computer or the battery power supply.This feature is incredibly useful in laptops for energy saving purposes.

How to activate or deactivate the USB selective suspension

Some users have indicated that sometimes the USB port does not turn on after applying the selective suspension.Or sometimes even go out without warning.To solve this problem, you must deactivate the USB selective suspension function on your system.Here's how to proceed:

In connection: USB suspension: The USB device does not enter selective suspension

Via les options d’alimentation

Open the configuration panel on your Windows PC.To do this, look for control panel in the search field.

Maintenant, accédez à ce chemin : Panneau de configuration > Matériel et audio > Options d’alimentation.

Click on your selected power plan, then click Modify the package settings.

This will bring you to a new page where you will have to click on modify the advanced power settings.

Now, a new, more detailed box of advanced power options will appear.There will be a menu that says USB settings.

Develop this option and you will find two subptions that will be labeled as on the battery and under tension.

You can choose to activate both individually according to your choice.

Click on it to make the change take place.

In connection: the selective suspension leads to stopping the operation of the USB devices on the USB concentrator.

Utilisation du registre Windows

To deactivate the selective suspension functionality via the registry editor, proceed as follows:

As this is a register operation, it is recommended to save the register or create a system restoration point as necessary precautionary measures.Once it is done, you can do it as follows:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USB

Si la USB la clé n’est pas présente, vous pouvez faire un clic droit sur la Prestations de service dossier sous-parent dans le volet de navigation de gauche, cliquez sur Nouvelle > Clé pour créer la clé de registre, puis renommer la clé en USB et appuyez sur Entrée.

Si la clé n’est pas présente, faites un clic droit sur l’espace vide dans le volet de droite, puis sélectionnez Nouvelle > Valeur DWORD (32 bits) pour créer la clé de registre, puis renommer la clé en Désactiver la suspension sélective et appuyez sur Entrée.

In our next article, we will see what you can do if the USB selective suspension is disabled.