---
name: "xhci"
section: "4freebsd"
platform: "linux"
package: "freebsd-manpages"
version: "12.2-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/xhci/4freebsd"
---

# xhci(4freebsd)

USB eXtensible Host Controller driver

## NAME

**xhci** – USB eXtensible Host Controller driver

## SYNOPSIS

**device xhci**

## DESCRIPTION

The **xhci** driver provides support for the USB eXtensible Host Controller Interface, which allows use of USB 1.0, 2.0 and 3.0 devices on the same USB port.

The XHCI controller supports USB connection speeds up to 5.0Gbps when using a USB 3.0 compliant device.

## HARDWARE

The **xhci** driver supports XHCI compatible controllers having PCI class 12 (serial bus), subclass 3 (USB) and programming interface 48 (XHCI).

## SYSCTL VARIABLES

The following variables are available as both [sysctl(8)](/sysctl/8.md) variables and [loader(8)](/loader/8.md) tunables:

- *hw.usb.xhci.debug*

  Debug output level, where 0 is debugging disabled and larger values increase debug message verbosity. Default is 0.

## SEE ALSO

[ehci(4)](/ehci/4.md), [ohci(4)](/ohci/4.md), [uhci(4)](/uhci/4.md), [usb(4)](/usb/4.md)

## HISTORY

The **xhci** device driver first appeared in FreeBSD 8.2.