27 percent of computers equipped with USB4 are experiencing limited functionality notifications when users connect USB-C devices that require specific features not supported by the PC. Microsoft mandates that USB-C ports on Windows PCs include essential features such as PC charging support and the capability to connect at least one external display, with a minimum power supply of 4.5 watts for accessories. Microsoft does not enforce higher transfer speeds or specific USB-PD wattage levels but expects USB-C ports to deliver USB 3.x speeds, display output, and charging support. Thunderbolt 4 and 5 ports support a comprehensive suite of USB-C capabilities, including high transfer speeds of 40 or 80Gbps and the ability to connect multiple external 4K displays while providing up to 15 watts of power for accessories. The Windows Hardware Compatibility Program (WHCP) provides automated testing tools for PC manufacturers to ensure compatibility with Windows and requires USB-C ports to utilize Windows' built-in USB drivers for streamlined fixes through Windows Update.