Microsoft urges OEMs to integrate USB Type-C notification support in Windows 11

Microsoft urges OEMs to integrate USB Type-C notification support in Windows 11

Improving USB Type-C Notifications in Windows 11

Windows 11 boasts extensive support for USB Type-C connectivity issues, addressing common challenges like connectivity failures, slow charging, and compatibility with various accessories. To maximize the effectiveness of these notifications, it is vital for original equipment manufacturers (OEMs) to integrate support into their devices effectively. Microsoft has begun urging OEMs to leverage the built-in notification system within Windows 11 to enhance reliability and improve user experiences.

Understanding Notification Limitations

Issues with USB Type-C notifications can often stem from manufacturing flaws at the OEM level. Windows 11 utilizes Advanced Configuration and Power Interface (ACPI) descriptors to differentiate USB Type-C ports and their specific functionalities. If these descriptors are missing or improperly configured, the expected notifications may fail to appear. For instance, if a USB Type-C port is inaccurately labeled as a Type-A port, users could receive misleading alerts or experience unpredictable behavior. Moreover, labeling a physically accessible port as “internal” can also suppress crucial notifications.

Guidelines for OEM Compliance

To address these challenges, Microsoft recommends several best practices for OEMs:

  • Conduct a comprehensive audit of ACPI descriptors for all USB ports.
  • Verify the notification functionality across different supported configurations.
  • Collaborate with Microsoft’s Windows Hardware Compatibility Program (WHCP) to ensure compliance with testing standards.
  • Document any anomalies or exceptions to standard behaviors.

Achieving compatibility involves utilizing tools such as the Windows Hardware Lab Kit (HLK), implementing both _UPC (USB Port Capabilities) and _PLD (Physical Location of Device) ACPI descriptors, and testing in a variety of scenarios to ensure reliable operation.

Data Transfer Policies and User Control

Additionally, Microsoft recognizes that some OEMs may wish to restrict data transfer over USB Type-C ports in untrusted environments. It is crucial, however, that these restrictions affect only external ports and do not hinder the functionality of critical components, like the keyboard or touchpad. Microsoft also recommends that OEMs provide user-friendly toggles, allowing customers to manage data transfer settings effortlessly. For a more detailed overview, you can read the blog post here.

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