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 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.

       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
       volume  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>

Debian                                          December 15, 2005                                SND_MAESTRO3(4)