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SND_HDA(4) FreeBSD Kernel Interfaces Manual SND_HDA(4) NAME snd_hda -- Intel High Definition Audio bridge device driver SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: device sound device snd_hda Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): snd_hda_load="YES" DESCRIPTION The snd_hda bridge device driver allows the generic audio driver, sound(4), to attach to Intel High Definition Audio devices. The snd_hda driver supports hardware that conforms with revision 1.0 of the Intel High Definition Audio specification and tries to behave much like the Microsoft Universal Audio Architecture (UAA) draft (revision 0.7b) for handling audio devices. HDA acts like a primary bus, similar to miibus(4), for handling various child buses such as audio, modem and HDMI (High Definition Multimedia Interface). Only audio is implemented in the snd_hda driver. The High Definition (HD) Audio specification was developed by Intel as the logical successor of the old AC'97 specification and has several advantages, such as higher bandwidth which allows more channels and more detailed formats, support for several logical audio devices, and general purpose DMA channels. The HDA specification defines the register-level interface, physical link characteristics, codec programming models, and codec architectural compo- nents. This specification is intended for both device driver developers and hardware component designers. Boot-time Configuration The following variables are available at boot-time through the device.hints(5) file: hint.pcm.%d.config Configures a range of possible options. Possi- ble values are: ``dmapos'', ``eapdinv'', ``gpio0'', ``gpio1'', ``gpio2'', ``gpio3'', ``gpio4'', ``gpio5'', ``gpio6'', ``gpio7'', ``gpioflush'', ``ivref'', ``ivref50'', ``ivref80'', ``ivref100'', ``fixedrate'', ``forcestereo'', ``ovref'', ``ovref50'', ``ovref80'', ``ovref100'', ``softpcmvol'', and ``vref''. An option prefixed with ``no'', such as ``nofixedrate'', will do the opposite and takes precedence. Options can be separated by whitespace and commas. Runtime Configuration The following sysctl(8) variables are available in addition to those available to all sound(4) devices: dev.pcm.%d.polling Experimental polling mode, where the driver operates by querying the device state on each tick using callout(9). Polling is disabled by default. Do not enable it unless you are fac- ing weird interrupt problems or if the device cannot generate interrupts at all. HARDWARE The snd_hda driver supports the following audio chipsets: +o ATI SB450 +o ATI SB600 +o Intel 631x/632xESB +o Intel 82801F +o Intel 82801G +o Intel 82801H +o Intel 82801I +o nVidia MCP51 +o nVidia MCP55 +o nVidia MCP61A +o nVidia MCP61B +o nVidia MCP65A +o nVidia MCP65B +o SiS 966 +o VIA VT8251/8237A Generic audio chipsets compatible with the Intel HDA specification should work, but have not been verified yet. The following codecs have been verified to work: +o Analog Devices AD1981HD +o Analog Devices AD1983 +o Analog Devices AD1986A +o Analog Devices AD1988 +o Analog Devices AD1988B +o CMedia CMI9880 +o Conexant Venice +o Conexant Waikiki +o Realtek ALC260 +o Realtek ALC262 +o Realtek ALC268 +o Realtek ALC660 +o Realtek ALC861 +o Realtek ALC861VD +o Realtek ALC880 +o Realtek ALC882 +o Realtek ALC883 +o Realtek ALC885 +o Realtek ALC888 +o Sigmatel STAC9220 +o Sigmatel STAC9220D/9223D +o Sigmatel STAC9221 +o Sigmatel STAC9221D +o Sigmatel STAC9227 +o Sigmatel STAC9271D +o VIA VT1708 +o VIA VT1709 SEE ALSO sound(4), device.hints(5), loader.conf(5), sysctl(8) HISTORY The snd_hda device driver first appeared in FreeBSD 6.3. AUTHORS The snd_hda driver was written by Stephane E. Potvin <sepotvin@videotron.ca> and Ariff Abdullah <ariff@FreeBSD.org>. This manual page was written by Joel Dahl <joel@FreeBSD.org>. BUGS There are a couple of missing features, such as support for Digital S/PDIF and multichannel output. A few Hardware/OEM vendors tend to screw up BIOS settings, thus rendering the snd_hda driver useless, which usually results in a state where the snd_hda driver seems to attach and work, but without any sound. FreeBSD 11.1 July 14, 2007 FreeBSD 11.1
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | SEE ALSO | HISTORY | AUTHORS | BUGS
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