SND_MAESTRO3(4) Kernel Interfaces Manual SND_MAESTRO3(4) NAME snd_maestro3 -- ESS Maestro3/Allegro-1 bridge device driver SYNOPSIS device sound device snd_maestro3 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 lap- top computers and feature an AC97 mixer, a multi-channel sample rate con- verter 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 Li- cense, and thus this driver is not included in the default GENERIC kernel. A convenient way to automatically load the driver is to add the line snd_maestro3_load="YES" to the file /boot/loader.conf. 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> FreeBSD 6.0 December 14, 2004 SND_MAESTRO3(4)
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS
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