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What's new in driver development for Windows 11, version 24H2

  • Article

This section describes new features and updates for driver development in Windows 11, version 24H2. To target this version of Windows, you can use WDK 10.0.26100.1 (released May 22, 2024).

Audio

Updates to the ACX audio class extensions overview and the Windows 11 APIs for Audio Processing Objects topics including new information on the following:

Camera and streaming media

Three new camera articles for Windows 11, version 24H2 (also applies to Windows 11, version 23H2):

  • Camera settings page - Describes the features and operation of the camera settings page in Windows 11, and the default values framework that allows configuration of the camera configuration applied when an application starts the camera.

  • Camera companion apps - Describes companion apps, an extensibility feature for manufacturers of cameras to build custom applications that can configure the camera and adjust default image settings.

  • Network cameras - Describes compatibility with ONVIF network cameras in Windows.

New camera KS Properties and DDIs:

Updated UVC MSXUs for framerate throttle and FoV2 additions. For more information, see Microsoft extensions to USB Video Class 1.5 specification.

Display and graphics drivers

GPUs are increasingly used in artificial intelligence and machine learning scenarios due to their computational power, parallel processing capabilities, and efficient handling of large datasets. Several new features are added to Windows Display Driver Model (WDDM) version 3.2 as optimizations to GPU/NPU usage, especially in cloud-based scenarios.

  • Dirty bit tracking enhances the performance of VRAM data transfer between physical hosts during the live migration of virtual machines.

  • Live migration of heterogeneous GPU-P compute devices has been added. Significant content can now be transferred while virtualized resources are still active, reducing the pause time needed to complete a migration.

  • A GPU native fence synchronization object is added as an extension to the monitored fence object, supporting the following additional features:

    • GPU wait on monitored fence value, which allows for high performance engine-to-engine synchronization without requiring CPU round trips.
    • Conditional interrupt notification only for GPU fence signals that have CPU waiters, enabling substantial power savings.
    • Fence value storage in the GPU's local memory.

  • User-mode work submission is an in-progress feature that is not yet enabled for final use. This feature allows user-mode drivers to submit work directly to the GPU without kernel-mode intervention.

Other added WDDM 3.2 features:

File system and filter drivers

Network drivers

  • Starting in Windows 11, version 24H2, you can write a User-Mode Driver Framework (UMDF) NetAdapterCx driver. The UMDF APIs in NetAdapterCx align with the KMDF versions, so you can convert your KMDF-based client driver to UMDF with little to no code changes.

  • UDP Receive Segment Coalescing Offload (URO) is a new hardware offload feature that enables network interface cards (NICs) to coalesce UDP receive segments. For more information, see UDP Receive Segment Coalescing Offload (URO) and NetAdapterCx URO.

  • WiFiCx Wi-Fi 7 introduces support for Wi-Fi 7 features, providing faster connectivity speeds, lower latency, and improved security. WiFiCx Wi-Fi 7 enables:

    • Multi-Link Operation (MLO) with roaming differentiation to leverage multiple simultaneous channels to the Wi-Fi access point (AP).
    • Enhanced capabilities for WPA3-SAE authentication and Opportunistic Wireless Encryption (OWE) with GCMP-256 cipher.

  • WiFiCx WPA3 SoftAP enables devices to set up a Soft Access Point (SoftAP) using the Wi-Fi Protected Access 3 - Simultaneous Authentication of Equals (WPA3-SAE) security protocol.

  • WiFiCx QoS R1 introduces advanced traffic management capabilities for WiFiCx devices. QoS R1 enables prioritization of Wi-Fi data packets through Mirrored Stream Classification Service (MSCS) and QoS Mapping (DSCP-to-UP Mapping).

Kernel

Four new wdm.h power management DDIs for Windows 11, version 24H2:

Storage drivers

Install

  • INF AddComClass directive: An AddComClass directive is used within a com-server-install-section and registers a COM class.
  • INF AddComServer directive: An AddComServer directive is used within a DDInstall.COM section and registers a COM server.
  • INF DDInstall.COM section: The DDInstall.COM section contains one or more INF AddComServer directives that reference other INF-writer-defined sections in an INF file.
  • The driver package INF registry conversion tool (reg2inf.exe) converts a registry key and its values or a COM .dll implementing a DllRegisterServer routine into a set of INF AddReg directives or INF DDInstall.COM section for in-proc COM servers for inclusion into a driver package INF file.

USB

Sensors

Driver security

Updates to the Windows CodeQL rules and updates to the Driver security checklist.

Windows debugging tools - WinDbg

Major new WinDbg features are listed here. For full details on the updates to WinDbg see WinDbg Release Notes. For general information about the debugging tools, see What is WinDbg?.

Live Linux debugging

You can now live debug a Linux process. For more information, see these topics:

Linux live remote process debugging

Linux symbols and sources

Other WinDbg updates and new features

For information on what was new for drivers in past Windows releases, see the following pages:

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