---
name: "nhi"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/nhi"
---

# nhi(4)

USB4 host interface

## NAME

**nhi** – USB4 host interface

## SYNOPSIS

**nhi\* at pci?**

## DESCRIPTION

The **nhi** driver provides support for the USB4 host interface.

The driver does not implement any meaningful USB4 connection manager functionality. It only puts the router that is part of the host interface into a sleep state during suspend.

## SEE ALSO

[intro(4)](/intro/4.md), [pci(4)](/pci/4.md), [xhci(4)](/xhci/4.md)

## HISTORY

The **nhi** driver first appeared in OpenBSD 7.9.

## AUTHORS

The **nhi** driver was written by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.