1 .\" Copyright (c) 2006 Joel Dahl <joel@FreeBSD.org>
2 .\" All rights reserved.
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5 .\" modification, are permitted provided that the following conditions
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32 .Nd "Intel High Definition Audio bridge device driver"
34 To compile this driver into the kernel, place the following lines in your
35 kernel configuration file:
36 .Bd -ragged -offset indent
41 Alternatively, to load the driver as a module at boot time, place the
44 .Bd -literal -offset indent
50 bridge device driver allows the generic audio driver,
52 to attach to Intel High Definition Audio devices.
55 driver supports hardware that conforms with revision 1.0 of the Intel High
56 Definition Audio specification and tries to behave much like the Microsoft
57 Universal Audio Architecture (UAA) draft (revision 0.7b) for handling audio
59 HDA acts like a primary bus, similar to
61 for handling various child buses such as audio, modem and HDMI (High Definition
62 Multimedia Interface).
63 Only audio is implemented in the
67 The High Definition (HD) Audio specification was developed by Intel as the
68 logical successor of the old AC'97 specification and has several advantages,
69 such as higher bandwidth which allows more channels and more detailed formats,
70 support for several logical audio devices, and general purpose DMA channels.
72 The HDA specification defines the register-level interface, physical link
73 characteristics, codec programming models, and codec architectural components.
74 This specification is intended for both device driver developers and hardware
76 .Ss Runtime Configuration
79 variables are available in addition to those available to all
82 .Bl -tag -width ".Va dev.pcm.%d.polling" -offset indent
83 .It Va dev.pcm.%d.polling
84 Experimental polling mode, where the driver operates by querying the device
85 state on each tick using
87 Polling is disabled by default.
88 Do not enable it unless you are facing weird interrupt problems or if the
89 device cannot generate interrupts at all.
94 driver supports the following audio chipsets:
127 Generic Audio chipsets compatible with the Intel HDA specification should work,
128 but have not been verified yet.
129 The following codecs have been verified to work:
133 Analog Device AD1981HD
137 Analog Device AD1986A
157 Sigmatel STAC9220D/9223D
169 device driver first appeared in
175 driver was written by
176 .An Stephane E. Potvin Aq sepotvin@videotron.ca
178 .An Ariff Abdullah Aq ariff@FreeBSD.org .
179 This manual page was written by
180 .An Joel Dahl Aq joel@FreeBSD.org .
182 There are a couple of missing features, such as support for Digital
183 S/PDIF and multichannel output.
185 A few Hardware/OEM vendors tend to screw up BIOS settings, thus
188 driver useless, which usually results in a state where the
190 driver seems to attach and work, but without any sound.