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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
     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 ker-
     nel.

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 (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 con-
     trol assumes that GD pins are wired to control the	hardware volume.  For
     systems that have the GPIO	pins wired to the hardware volume control but-
     tons, 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	9.3		       December	15, 2005		   FreeBSD 9.3

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

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=snd_maestro3&sektion=4&manpath=FreeBSD+8.2-RELEASE>

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