Microsoft reported that 27% of PCs utilizing USB4 have issued limited functionality notifications, indicating that certain expected features were not available. They stress the necessity for USB-C ports to support essential functions like PC charging and at least one external display. While there are no strict mandates for speed or PCI Express support, basic functionality is expected. Intel continues to certify Thunderbolt specifications which encompass more capabilities. To aid in the ecosystem, the WHCP program is introducing automated testing to help PC manufacturers ensure compatibility with Windows.
Windows Diagnostics Data shows that 27 percent of PCs with USB4 have encountered a limited functionality notification, meaning that a customer plugged a USB-C device in, but a feature (alternate mode) that device needs was not implemented on the PC and Windows notified the user.
According to Microsoft, all USB-C ports must include 'PC charging support' and support for a minimum of one external display, plus the ability to supply at least 4.5 W of power to a connected accessory.
Microsoft says that Intel still handles certification for its Thunderbolt specification, and that Thunderbolt 4 and 5 ports still handle a superset of all USB-C capabilities, including support for PCI Express devices.
The WHCP program provides automated testing tools that PC companies can use to ensure that their new systems work as expected with Windows, allowing Microsoft to collect data and resolve issues.
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