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+This file explains the codec-specific mixer controls.
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+
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+Realtek codecs
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+--------------
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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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+
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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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+
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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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+
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+
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+IDT/Sigmatel codecs
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+-------------------
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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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+
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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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+
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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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+
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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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+
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+
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+VIA codecs
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+----------
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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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+
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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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+
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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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+
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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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+
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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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+
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+
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+Conexant codecs
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+---------------
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+
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+* Auto-Mute Mode
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+ See Reatek codecs.
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Takashi Iwai