snd_maestro3 man page on FreeBSD

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SND_MAESTRO3(4)		 BSD 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:

     ·	 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 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⟩

BSD			       December 15, 2005			   BSD
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