1.\" Copyright (c) 2001 Scott Long 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd August 28, 2004 28.Dt SND_MAESTRO3 4 29.Os 30.Sh NAME 31.Nm snd_maestro3 32.Nd FreeBSD audio sub-driver for ESS Maestro3/Allegro-1 hardware 33.Sh SYNOPSIS 34.Cd "device sound" 35.Cd "device snd_maestro3" 36.Sh DESCRIPTION 37The 38.Nm 39driver provides support for the ESS Maestro3 and Allegro-1 sound chips 40under the PCM framework. 41These chips are mostly found in laptop computers and feature an AC97 mixer, 42a multi-channel sample rate converter that can mix up to four digital audio 43streams in hardware, recording support, and external volume control buttons. 44.Pp 45The firmware for the sound processor is licensed under the GNU Public 46License, and thus this driver is not included in the default 47.Pa GENERIC 48kernel, nor is it compiled into the kernel when 49.Cd "device sound" 50is specified in the kernel config file. 51A convenient way to automatically load the driver is to add the line 52.Pp 53.Dl snd_maestro3_load="YES" 54.Pp 55to the file 56.Pa /boot/loader.conf . 57.Sh DIAGNOSTICS 58The hardware volume control buttons can be connected to two different pin 59sets on the chip, depending on the manufacturer. 60The driver has no way of determining this configuration, so a hint may be 61used to override the default guess. 62Add the line 63.Dq Li hint.pcm.0.hwvol_config="0" 64to the file 65.Pa /boot/device.hints 66to override the default setting. 67.Sh SEE ALSO 68.Xr sound 4 , 69.Xr loader.conf 5 70.Sh HISTORY 71The 72.Nm 73driver first appeared in 74.Fx 4.3 . 75.Sh AUTHORS 76.An Scott Long Aq scottl@FreeBSD.org 77.An Darrel Anderson Aq anderson@cs.duke.edu 78