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SND_MAESTRO3(4)	       FreeBSD Kernel Interfaces Manual	       SND_MAESTRO3(4)

NAME
     snd_maestro3 -- ESS Maestro3/Allegro-1 bridge device driver

SYNOPSIS
     device sound
     device "snd_maestro3"

DESCRIPTION
     The snd_maestro3 driver provides support for the ESS Maestro3 and Alle-
     gro-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.

     The firmware for the sound	processor is licensed under the	GNU Public
     License, and thus this driver is not included in the default GENERIC ker-
     nel.  A convenient	way to automatically load the driver is	to add the
     line

	   snd_maestro3_load="YES"

     to	the file /boot/loader.conf.

HARDWARE
     The snd_maestro3 driver supports the following audio devices:

     +o	 ESS Technology	Allegro-1
     +o	 ESS Technology	Maestro3

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 ``hint.pcm.0.hwvol_config="0"'' to the file
     /boot/device.hints	to override the	default	setting.

SEE ALSO
     sound(4), loader.conf(5)

HISTORY
     The snd_maestro3 driver first appeared in FreeBSD 4.3.

AUTHORS
     Scott Long	<scottl@FreeBSD.org>
     Darrel Anderson <anderson@cs.duke.edu>

FreeBSD	9.2		       December	14, 2004		   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS

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