The driver enables your operating system to communicate with these controllers for , backward compatibility with USB 2.0/1.1, and proper power management.

The safest place to get the driver is not a generic "driver database" site, but rather your (e.g., ASUS, Gigabyte, MSI, Dell, HP).

Later, acquired NEC’s semiconductor division. Consequently, drivers that were originally labeled "NEC Electronics" became "Renesas Electronics" drivers. You will often see these names used interchangeably in forums and driver download centers.

| Problem | Solution | |---------|----------| | | Disable Driver Signature Enforcement (boot into Advanced Startup → Disable driver signing) for older drivers on Windows 10/11. | | USB 3.0 ports work as USB 2.0 | Update firmware of the Renesas controller (rare, but possible). Check motherboard BIOS update. | | Blue screen (BSOD) with usbxhci.sys | Uninstall driver, boot to Safe Mode, delete any Renesas driver remnants from C:\Windows\System32\drivers , then reinstall a newer version. | | Windows automatically reverts to Microsoft driver | Use Group Policy (Windows Pro) or Device Installation Settings → “No” to automatic driver updates for that device. | | Driver causes sleep/wake issues | In Device Manager → Properties → Power Management → Disable “Allow the computer to turn off this device” for each USB Root Hub under Renesas controller. |