81 lines
2.9 KiB
Groff
81 lines
2.9 KiB
Groff
.\" $NetBSD: auich.4,v 1.25 2016/10/16 05:26:20 wiz Exp $
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.\"
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.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd October 13, 2016
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.Dt AUICH 4
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.Os
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.Sh NAME
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.Nm auich
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.Nd Intel I/O Controller Hub integrated AC'97 audio device driver
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.Sh SYNOPSIS
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.Cd "auich* at pci? dev ? function ?"
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.Cd "audio* at audiobus?"
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.Sh DESCRIPTION
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The
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.Nm
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device driver supports the integrated AC'97 audio controller
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of the Intel I/O Controller Hub.
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Supported chipsets include the i82801AA (ICH), i82801AB (ICH0),
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i82801BA (ICH2), i82440MX, i82801CA (ICH3), i82801DB (ICH4), i82801EB (ICH5),
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i82801FB (ICH6), i82801GB/GR (ICH7), and Intel 6300ESB.
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The driver also supports SiS 7012, nForce MCP, nForce2 MCP-T,
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nForce3 MCP-T, nForce3 250 MCP-T, nForce4, and AMD 8111.
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.Pp
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The driver provides the following
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.Xr sysctl 8
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read/write variable (when hardware support is available):
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.Bl -tag -width Ds
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.It Va hw.auich0.ac97rate
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Link rate of the device in Hz.
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The driver automatically measures and
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calculates the correct rate so you usually don't need to change
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this.
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There is, however, a chance that the driver miscalculates the
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rate especially on an emulated hardware, resulting in an incorrect
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playback pitch.
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When this happens you need to manually set this
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variable to the correct value.
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Try
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.Li 48000
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if you don't know the correct value as it is the default link rate.
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.Sh SEE ALSO
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.Xr ac97 4 ,
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.Xr audio 4 ,
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.Xr pci 4 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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device driver appeared in
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.Nx 1.6 .
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.Sh BUGS
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The
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.Sq microphone
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input DMA channel is not currently supported.
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