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:

              •  Orange = Center/LFE

              •  Blue = Line-in

              •  Black = Rear

              •  Green = Front

              •  Grey = Side

              •  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

       •  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.

       •  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

                                                11 February 2015                                  oss_hdaudio(7)