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

                                         17 January 2023                           oss_hdaudio(7)