1 .\" Copyright (c) 2001 Scott Long
2 .\" All rights reserved.
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32 .Nd "ESS Maestro3/Allegro-1 bridge device driver"
35 .Cd "device snd_maestro3"
39 driver provides support for the ESS Maestro3 and Allegro-1 sound chips
40 under the PCM framework.
41 These chips are mostly found in laptop computers and feature an AC97 mixer,
42 a multi-channel sample rate converter that can mix up to four digital audio
43 streams in hardware, recording support, and external volume control buttons.
45 The firmware for the sound processor is licensed under the GNU Public
46 License, and thus this driver is not included in the default
49 A convenient way to automatically load the driver is to add the line
51 .Dl snd_maestro3_load="YES"
54 .Pa /boot/loader.conf .
58 driver supports the following audio devices:
62 ESS Technology Allegro-1
64 ESS Technology Maestro3
67 The hardware volume control buttons can be connected to two different pin
68 sets on the chip, depending on the manufacturer.
69 The driver has no way of determining this configuration, so a hint may be
70 used to override the default guess.
72 .Dq Li hint.pcm.0.hwvol_config="0"
74 .Pa /boot/device.hints
75 to override the default setting.
82 driver first appeared in
85 .An Scott Long Aq scottl@FreeBSD.org
86 .An Darrel Anderson Aq anderson@cs.duke.edu