cmpci(4)

cmpci4

C-media cmi8338/cmi8738/cmi8768 pci audio device

Usage

cmpci* at pci? audio* at cmpci?

Overview

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

Releases

55 releases since OpenBSD 2.7; the text changed 10 times.

  1. 2.7
  2. 2.8
  3. 2.9–3.1
  4. 3.2
  5. 3.3–3.6
  6. 3.7–3.9
  7. 4.0–4.1
  8. 4.2
  9. 4.3
  10. 4.4–4.7
  11. 4.8–8.0

History

The cmpci device driver appeared in OpenBSD 2.7.

Bugs

The Joystick port is not supported.

From man 8.0-current-20261101 in OpenBSD 8.0-current (2026-11-01). Parsed by carta from the page's mdoc source.