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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 5.4		       December 14, 2004		   FreeBSD 5.4

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