122 lines
4.4 KiB
ReStructuredText
122 lines
4.4 KiB
ReStructuredText
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======================================
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HD-Audio Codec-Specific Mixer Controls
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======================================
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This file explains the codec-specific mixer controls.
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Realtek codecs
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--------------
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Channel Mode
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This is an enum control to change the surround-channel setup,
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appears only when the surround channels are available.
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It gives the number of channels to be used, "2ch", "4ch", "6ch",
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and "8ch". According to the configuration, this also controls the
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jack-retasking of multi-I/O jacks.
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Auto-Mute Mode
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This is an enum control to change the auto-mute behavior of the
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headphone and line-out jacks. If built-in speakers and headphone
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and/or line-out jacks are available on a machine, this controls
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appears.
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When there are only either headphones or line-out jacks, it gives
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"Disabled" and "Enabled" state. When enabled, the speaker is muted
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automatically when a jack is plugged.
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When both headphone and line-out jacks are present, it gives
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"Disabled", "Speaker Only" and "Line-Out+Speaker". When
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speaker-only is chosen, plugging into a headphone or a line-out jack
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mutes the speakers, but not line-outs. When line-out+speaker is
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selected, plugging to a headphone jack mutes both speakers and
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line-outs.
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IDT/Sigmatel codecs
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-------------------
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Analog Loopback
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This control enables/disables the analog-loopback circuit. This
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appears only when "loopback" is set to true in a codec hint
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(see HD-Audio.txt). Note that on some codecs the analog-loopback
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and the normal PCM playback are exclusive, i.e. when this is on, you
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won't hear any PCM stream.
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Swap Center/LFE
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Swaps the center and LFE channel order. Normally, the left
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corresponds to the center and the right to the LFE. When this is
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ON, the left to the LFE and the right to the center.
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Headphone as Line Out
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When this control is ON, treat the headphone jacks as line-out
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jacks. That is, the headphone won't auto-mute the other line-outs,
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and no HP-amp is set to the pins.
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Mic Jack Mode, Line Jack Mode, etc
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These enum controls the direction and the bias of the input jack
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pins. Depending on the jack type, it can set as "Mic In" and "Line
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In", for determining the input bias, or it can be set to "Line Out"
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when the pin is a multi-I/O jack for surround channels.
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VIA codecs
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----------
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Smart 5.1
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An enum control to re-task the multi-I/O jacks for surround outputs.
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When it's ON, the corresponding input jacks (usually a line-in and a
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mic-in) are switched as the surround and the CLFE output jacks.
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Independent HP
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When this enum control is enabled, the headphone output is routed
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from an individual stream (the third PCM such as hw:0,2) instead of
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the primary stream. In the case the headphone DAC is shared with a
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side or a CLFE-channel DAC, the DAC is switched to the headphone
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automatically.
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Loopback Mixing
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An enum control to determine whether the analog-loopback route is
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enabled or not. When it's enabled, the analog-loopback is mixed to
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the front-channel. Also, the same route is used for the headphone
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and speaker outputs. As a side-effect, when this mode is set, the
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individual volume controls will be no longer available for
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headphones and speakers because there is only one DAC connected to a
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mixer widget.
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Dynamic Power-Control
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This control determines whether the dynamic power-control per jack
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detection is enabled or not. When enabled, the widgets power state
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(D0/D3) are changed dynamically depending on the jack plugging
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state for saving power consumptions. However, if your system
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doesn't provide a proper jack-detection, this won't work; in such a
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case, turn this control OFF.
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Jack Detect
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This control is provided only for VT1708 codec which gives no proper
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unsolicited event per jack plug. When this is on, the driver polls
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the jack detection so that the headphone auto-mute can work, while
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turning this off would reduce the power consumption.
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Conexant codecs
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---------------
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Auto-Mute Mode
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See Reatek codecs.
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Analog codecs
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--------------
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Channel Mode
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This is an enum control to change the surround-channel setup,
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appears only when the surround channels are available.
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It gives the number of channels to be used, "2ch", "4ch" and "6ch".
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According to the configuration, this also controls the
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jack-retasking of multi-I/O jacks.
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Independent HP
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When this enum control is enabled, the headphone output is routed
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from an individual stream (the third PCM such as hw:0,2) instead of
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the primary stream.
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