---
name: "cmpci"
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/cmpci"
---

# cmpci(4)

C-Media CMI8338/CMI8738/CMI8768 PCI audio device

## NAME

**cmpci** – C-Media CMI8338/CMI8738/CMI8768 PCI audio device

## SYNOPSIS

**cmpci\* at pci?** **audio\* at cmpci?**

## DESCRIPTION

The **cmpci** driver supports the C-Media CMI8338A, CMI8338B, CMI8738, CMI8738B and CMI8768 sound chips present in some PCI sound cards and some integrated PC motherboard chipsets (such as the SiS 530).

Hardware features:

- Supports 8 common sample rates from 5512 Hz to 48000 Hz

- Hardware full-duplex support enables simultaneous record and playback

- Some CMI8738 versions support 4 and 6 channel playback

- CMI8768 chips support 4, 6, and 8 channel playback

- CMI8768 chips can only record sample rates of 44100 Hz or 48000 Hz

- Hardware copying of front to rear for playing stereo input on 4 speakers

- S/PDIF input and output

## SEE ALSO

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

## HISTORY

The **cmpci** device driver appeared in OpenBSD 2.7.

## BUGS

The Joystick port is not supported.