1 .\" Copyright (c) 2001 Scott Long
2 .\" All rights reserved.
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32 .Nd FreeBSD audio sub-driver for ESS Maestro3/Allegro-1 hardware
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
48 kernel, nor is it compiled into the kernel when
50 is specified in the kernel config file.
51 A convenient way to automatically load the driver is to add the line
53 .Dl snd_maestro3_load="YES"
56 .Pa /boot/loader.conf .
58 The hardware volume control buttons can be connected to two different pin
59 sets on the chip, depending on the manufacturer.
60 The driver has no way of determining this configuration, so a hint may be
61 used to override the default guess.
63 .Dq Li hint.pcm.0.hwvol_config="0"
65 .Pa /boot/device.hints
66 to override the default setting.
73 driver first appeared in
76 .An Scott Long Aq scottl@FreeBSD.org
77 .An Darrel Anderson Aq anderson@cs.duke.edu