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1 .\" Copyright (c) 2006 Joel Dahl <joel@FreeBSD.org>
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25 .\" $FreeBSD: src/share/man/man4/snd_hda.4,v 1.10.2.1 2007/05/15 18:40:22 joel Exp $
26 .\" $DragonFly: src/share/man/man4/snd_hda.4,v 1.2 2007/06/16 17:44:33 hasso Exp $
27 .\"
28 .Dd May 5, 2007
29 .Dt SND_HDA 4
30 .Os
31 .Sh NAME
32 .Nm snd_hda
33 .Nd "Intel High Definition Audio bridge device driver"
34 .Sh SYNOPSIS
35 To compile this driver into the kernel, place the following lines in your
36 kernel configuration file:
37 .Bd -ragged -offset indent
38 .Cd "device pcm"
39 .Cd "device snd_hda"
40 .Ed
41 .Pp
42 Alternatively, to load the driver as a module at boot time, place the
43 following line in
44 .Xr loader.conf 5 :
45 .Bd -literal -offset indent
46 snd_hda_load="YES"
47 .Ed
48 .Sh DESCRIPTION
49 The
50 .Nm
51 bridge device driver allows the generic audio driver,
52 .Xr sound 4 ,
53 to attach to Intel High Definition Audio devices.
54 The
55 .Nm
56 driver supports hardware that conforms with revision 1.0 of the Intel High
57 Definition Audio specification and tries to behave much like the Microsoft
58 Universal Audio Architecture (UAA) draft (revision 0.7b) for handling audio
59 devices.
60 HDA acts like a primary bus, similar to
61 .Xr miibus 4 ,
62 for handling various child buses such as audio, modem and HDMI (High Definition
63 Multimedia Interface).
64 Only audio is implemented in the
65 .Nm
66 driver.
67 .Pp
68 The High Definition (HD) Audio specification was developed by Intel as the
69 logical successor of the old AC'97 specification and has several advantages,
70 such as higher bandwidth which allows more channels and more detailed formats,
71 support for several logical audio devices, and general purpose DMA channels.
72 .Pp
73 The HDA specification defines the register-level interface, physical link
74 characteristics, codec programming models, and codec architectural components.
75 This specification is intended for both device driver developers and hardware
76 component designers.
77 .Ss Runtime Configuration
78 The following
79 .Xr sysctl 8
80 variables are available in addition to those available to all
81 .Xr sound 4
82 devices:
83 .Bl -tag -width ".Va dev.pcm.%d.polling" -offset indent
84 .It Va dev.pcm.%d.polling
85 Experimental polling mode, where the driver operates by querying the device
86 state on each tick using
87 .Xr callout 9 .
88 Polling is disabled by default.
89 Do not enable it unless you are facing weird interrupt problems or if the
90 device cannot generate interrupts at all.
91 .El
92 .Sh HARDWARE
93 The
94 .Nm
95 driver supports the following audio chipsets:
96 .Pp
97 .Bl -bullet -compact
98 .It
99 ATI SB450
100 .It
101 ATI SB600
102 .It
103 Intel 631x/632xESB
104 .It
105 Intel 82801F
106 .It
107 Intel 82801G
108 .It
109 Intel 82801H
110 .It
111 nVidia MCP51
112 .It
113 nVidia MCP55
114 .It
115 nVidia MCP61A
116 .It
117 nVidia MCP61B
118 .It
119 nVidia MCP65A
120 .It
121 nVidia MCP65B
122 .It
123 SiS 966
124 .It
125 VIA VT8251/8237A
126 .El
127 .Pp
128 Generic audio chipsets compatible with the Intel HDA specification should work,
129 but have not been verified yet.
130 The following codecs have been verified to work:
131 .Pp
132 .Bl -bullet -compact
133 .It
134 Analog Device AD1981HD
135 .It
136 Analog Device AD1983
137 .It
138 Analog Device AD1986A
139 .It
140 Analog Device AD1988
141 .It
142 CMedia CMI9880
143 .It
144 Conexant Venice
145 .It
146 Conexant Waikiki
147 .It
148 Realtek ALC260
149 .It
150 Realtek ALC262
151 .It
152 Realtek ALC861
153 .It
154 Realtek ALC861VD
155 .It
156 Realtek ALC880
157 .It
158 Realtek ALC882
159 .It
160 Realtek ALC883
161 .It
162 Realtek ALC885
163 .It
164 Realtek ALC888
165 .It
166 Sigmatel STAC9220
167 .It
168 Sigmatel STAC9220D/9223D
169 .It
170 Sigmatel STAC9221
171 .It
172 Sigmatel STAC9221D
173 .It
174 Sigmatel STAC9227
175 .It
176 Sigmatel STAC9271D
177 .It
178 VIA VT1708
179 .It
180 VIA VT1709
181 .El
182 .Sh SEE ALSO
183 .Xr sound 4 ,
184 .Xr loader.conf 5 ,
185 .Xr sysctl 8
186 .Sh HISTORY
187 The
188 .Nm
189 device driver first appeared in
190 .Fx 7.0 .
191 .Sh AUTHORS
192 .An -nosplit
193 The
194 .Nm
195 driver was written by
196 .An Stephane E. Potvin Aq sepotvin@videotron.ca
197 and
198 .An Ariff Abdullah Aq ariff@FreeBSD.org .
199 This manual page was written by
200 .An Joel Dahl Aq joel@FreeBSD.org .
201 .Sh BUGS
202 There are a couple of missing features, such as support for Digital
203 S/PDIF and multichannel output.
204 .Pp
205 A few Hardware/OEM vendors tend to screw up BIOS settings, thus
206 rendering the
207 .Nm
208 driver useless, which usually results in a state where the
209 .Nm
210 driver seems to attach and work, but without any sound.