7(August 31, 2006)

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:
 o 8-96Khz Playback/Recording
 o 8 or 16 or 32 bits
 o 2, 4, 6 or 8 channel audio.
 o SPDIF digital output and Input
 o 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

•
    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
 /usr/lib/oss/conf/oss_hdaudio.conf Device configuration file

AUTHOR
 4Front Technologies