.\" $OpenBSD: auich.4,v 1.16 2005/04/05 01:44:41 mickey Exp $
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.\" Copyright (c) 2000-2001 Michael Shalayeff
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.Dd May 30, 2000
.Dt AUICH 4
.Os
.Sh NAME
.Nm auich
.Nd Intel 82801AA/AB/BA/CA/DB/EB/FB, 82440MX, and compatibles PCI audio driver
.Sh SYNOPSIS
.Cd "auich* at pci? flags 0x0000"
.Cd "audio* at auich?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the AC97-based audio present on the Intel
82801AA/AB/BA/CA/DB/EB/FB I/O controller hub
(ICH, ICH0, ICH2, ICH3, ICH4, ICH5, ICH6),
82440MX chipset, SiS 7012, AMD 768, AMD 8111, NVIDIA nForce and nForce2 chips.
The
.Nm
DMA engine supports full-duplex operation and has separate channels
for line input and microphone.
Unfortunately, simultaneous recording from both line and microphone inputs
is not supported due to the current
.Xr ac97 4
design.
Setting
.Ar flags
to 0x0001 will compensate for machines that have reversed stereo.
.Sh SEE ALSO
.Xr ac97 4 ,
.Xr audio 4 ,
.Xr intro 4 ,
.Xr pci 4
.Sh HISTORY
The
.Nm
device driver appeared in
.Ox 2.8 .
.Sh CAVEATS
Some hardware implementations only support 48kHz sampling rates.