NAME

       oss_hdaudio - Intel High Definition Audio (AZALIA)

DESCRIPTION

       Open  Sound  System driver for Intels high definition audio known as "Azalia". This driver supports Intel
       915/925 chipsets with the Realtek ALC880 and CMedia 9880 8 channel codecs.

       The HDA driver supports:

       •  8-96Khz Playback/Recording

       •  8 or 16 or 32 bits

       •  2, 4, 6 or 8 channel audio.

       •  SPDIF digital output and Input

       •  AC3 passthrough

   HDAUDIO MIXER
       The Intel HDA mixer is a new type of mixer that doesn't have the normal volume controls found on AC97  or
       legacy SB devices.  The HDA mixer presents a concept of Jacks and you can configure any jack to be either
       an output or an input jack.

       Some  motherboards  may not correctly initialize the jacks according to their color and functionality but
       in general here's the configuration that should generally be followed:

              o Orange = Center/LFE
                     o Blue = Line-in

              o Black = Rear
                     o Green = Front

              o Grey = Side
                     o Pink = Mic

       Some Azalia codecs support front panel connectors and so if you see fp-green and fp-pink connectors, then
       these are for front panel speaker and mic/line-in Jacks.

              There is a function selector for most of the analog audio jacks (for example connector.pink.mode).
              This selector is used to control if the jack is used as an input (microphone or line in) or output
              (front, rear, side, speaker, etc).

KNOWN PROBLEMS

       In general Azalia based systems (laptops/motherboards) would require a custom driver  to  work  properly.
       Due  to  enormous  number  of different systems it is not possible to develop such custom drivers for all
       systems. A generic driver is used for systems that don't have dedicated drivers.

       Unfortunately the mixer and control panel interface (see ossmix(1)) for "generic" systems is very cryptic
       and difficult to understand. To solve  problems  with  volumes  or  signal  routing  you  need  to  start
       ossxmix(1) and change the controls one at time until you get the desired effect.

OPTIONS

       o hdaudio_jacksense
              enables  jack  sensing mode when the hdaudio driver is loaded. In this mode all I/O pin's that are
              not in use will be disabled as well as the mixer controls that are related with them. In this  way
              the  mixer/control  panel  will become more intuitive.  However OSS will need to be restarted with
              soundoff; soundon every time new inputs or outputs are attached to the audio jacks. Default : 0.

              NOTE! hdaudio_jacksense=1 works only in some systems.  Many laptops and motherboards don't support
              jack sensing.

       o hdaudio_noskip
              Disable skipping unconnected jack. All mixer controls will be shown, even for disabled  I/O  pins.
              Can  get  values 0-7. 1-7 is a bitmask, where every bit masks a different check. Bit 3 (= value 4)
              overrides jacksense check too.  Default: 0 - unconnected jacks are skipped.

FILES

       /etc/oss4/conf/oss_hdaudio.conf Device configuration file

AUTHOR

       4Front Technologies

                                                13 November 2019                                  oss_hdaudio(7)