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USB4 Systems BIOS Handoff Support

  • Article

Verifies that systems with USB4 host routers support TBD BIOS handoff mechanism.

Description

Systems with USB4 host routers must support BIOS handoff per update to the Advanced Configuration and Power Interface (ACPI) 6.4 specification, section 6.2.11.2 Platform-Wide OSPM Capabilities. The system must grant control of "Native USB4 Support" in Platform-Wide OSPM Capabilities (UUID: 0811B06E-4A27-44F9-8D60-3CBBC22E7B48) for OS versions that support software CM. The control is granted when _OSC is called by OS with Query Flag set to 0 and Native USB4 Support set to 1.

On OS downgrade to an OS that does not support software connection manager, when the _OSC method is called with Query Flag set to 0 and Native USB4 Support set to 0, the platform must switch to firmware CM if supported in the system.

Test details

   
Specifications
  • System.Fundamentals.SystemUSB.USB4.BiosHandOff
Platforms
  • Windows 10, client editions (x86)
  • Windows 10, client editions (x64)
  • Windows 10, client editions (Arm)
  • Windows 10, client editions (Arm64)
Supported Releases
  • Windows 11
  • Next update to Windows 11
Expected run time (in minutes) 5
Category Development and Integration
Timeout (in minutes) 5
Requires reboot False
Requires special configuration False
Type development

Additional documentation

Tests in this feature area might have additional documentation, including prerequisites, setup, and troubleshooting information, that can be found in the following topics:

More information

Parameters

None

Enhancement scenarios

Enable switching between operating systems that may or may not support software CM. For example, OS roll-back or dual-boot.

Troubleshooting

For generic troubleshooting of HLK test failures, see Troubleshooting Windows HLK Test Failures.