freebsd-nq/share/man/man4/snd_maestro3.4

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.\" Copyright (c) 2001 Scott Long
.\" All rights reserved.
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.\" $FreeBSD$
.\"
.Dd December 14, 2004
.Dt SND_MAESTRO3 4
.Os
.Sh NAME
.Nm snd_maestro3
.Nd "ESS Maestro3/Allegro-1 bridge device driver"
.Sh SYNOPSIS
.Cd "device sound"
.Cd "device snd_maestro3"
.Sh DESCRIPTION
The
.Nm
driver provides support for the ESS Maestro3 and Allegro-1 sound chips
under the PCM framework.
These chips are mostly found in laptop computers and feature an AC97 mixer,
a multi-channel sample rate converter that can mix up to four digital audio
streams in hardware, recording support, and external volume control buttons.
.Pp
The firmware for the sound processor is licensed under the GNU Public
License, and thus this driver is not included in the default
.Pa GENERIC
kernel.
A convenient way to automatically load the driver is to add the line
.Pp
.Dl snd_maestro3_load="YES"
.Pp
to the file
.Pa /boot/loader.conf .
.Sh HARDWARE
The
.Nm
driver supports the following audio devices:
.Pp
.Bl -bullet -compact
.It
ESS Technology Allegro-1
.It
ESS Technology Maestro3
.El
.Sh DIAGNOSTICS
The hardware volume control buttons can be connected to two different pin
sets on the chip, depending on the manufacturer.
The driver has no way of determining this configuration, so a hint may be
used to override the default guess.
Add the line
.Dq Li hint.pcm.0.hwvol_config="0"
to the file
.Pa /boot/device.hints
to override the default setting.
.Sh SEE ALSO
.Xr sound 4 ,
.Xr loader.conf 5
.Sh HISTORY
The
.Nm
driver first appeared in
.Fx 4.3 .
.Sh AUTHORS
.An Scott Long Aq scottl@FreeBSD.org
.An Darrel Anderson Aq anderson@cs.duke.edu