maestro3 -- FreeBSD audio sub-driver for ESS Maestro3/Allegro-1 hardware
The 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,
nor is it compiled into the kernel when device pcm is specified in
the kernel config file. A convenient way to automatically load the
driver is to add the line
to the file /boot/loader.conf.
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.
The maestro3 driver first appeared in FreeBSD 4.3.
Scott Long <scottl@FreeBSD.org>
Darrel Anderson <email@example.com>
FreeBSD 5.2.1 October 14, 2001 FreeBSD 5.2.1 [ Back ]