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SND_MAESTRO3(4)		    Kernel Interfaces Manual	       SND_MAESTRO3(4)

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

SYNOPSIS
       To  compile  this  driver into the kernel, place	the following lines in
       your kernel configuration file:

	     device sound
	     device snd_maestro3

       Alternatively, to load the driver as a module at	boot time,  place  the
       following line in loader.conf(5):

	     snd_maestro3_load="YES"

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
       kernel.

HARDWARE
       The snd_maestro3	driver supports	the following audio devices:

       •   ESS Technology Allegro-1
       •   ESS Technology Maestro3

DIAGNOSTICS
       The hardware volume control buttons can be connected to	two  different
       pin  sets (GPIO or GD) 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.  The default setting for hardware
       volume control assumes that GD pins are wired to	control	 the  hardware
       volume.	For systems that have the GPIO pins wired to the hardware vol-
       ume  control buttons, 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	13.2		       December	15, 2005	       SND_MAESTRO3(4)
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS

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