0001 ======================================
0002 HD-Audio Codec-Specific Mixer Controls
0003 ======================================
0004
0005
0006 This file explains the codec-specific mixer controls.
0007
0008 Realtek codecs
0009 --------------
0010
0011 Channel Mode
0012 This is an enum control to change the surround-channel setup,
0013 appears only when the surround channels are available.
0014 It gives the number of channels to be used, "2ch", "4ch", "6ch",
0015 and "8ch". According to the configuration, this also controls the
0016 jack-retasking of multi-I/O jacks.
0017
0018 Auto-Mute Mode
0019 This is an enum control to change the auto-mute behavior of the
0020 headphone and line-out jacks. If built-in speakers and headphone
0021 and/or line-out jacks are available on a machine, this controls
0022 appears.
0023 When there are only either headphones or line-out jacks, it gives
0024 "Disabled" and "Enabled" state. When enabled, the speaker is muted
0025 automatically when a jack is plugged.
0026
0027 When both headphone and line-out jacks are present, it gives
0028 "Disabled", "Speaker Only" and "Line-Out+Speaker". When
0029 speaker-only is chosen, plugging into a headphone or a line-out jack
0030 mutes the speakers, but not line-outs. When line-out+speaker is
0031 selected, plugging to a headphone jack mutes both speakers and
0032 line-outs.
0033
0034
0035 IDT/Sigmatel codecs
0036 -------------------
0037
0038 Analog Loopback
0039 This control enables/disables the analog-loopback circuit. This
0040 appears only when "loopback" is set to true in a codec hint
0041 (see HD-Audio.txt). Note that on some codecs the analog-loopback
0042 and the normal PCM playback are exclusive, i.e. when this is on, you
0043 won't hear any PCM stream.
0044
0045 Swap Center/LFE
0046 Swaps the center and LFE channel order. Normally, the left
0047 corresponds to the center and the right to the LFE. When this is
0048 ON, the left to the LFE and the right to the center.
0049
0050 Headphone as Line Out
0051 When this control is ON, treat the headphone jacks as line-out
0052 jacks. That is, the headphone won't auto-mute the other line-outs,
0053 and no HP-amp is set to the pins.
0054
0055 Mic Jack Mode, Line Jack Mode, etc
0056 These enum controls the direction and the bias of the input jack
0057 pins. Depending on the jack type, it can set as "Mic In" and "Line
0058 In", for determining the input bias, or it can be set to "Line Out"
0059 when the pin is a multi-I/O jack for surround channels.
0060
0061
0062 VIA codecs
0063 ----------
0064
0065 Smart 5.1
0066 An enum control to re-task the multi-I/O jacks for surround outputs.
0067 When it's ON, the corresponding input jacks (usually a line-in and a
0068 mic-in) are switched as the surround and the CLFE output jacks.
0069
0070 Independent HP
0071 When this enum control is enabled, the headphone output is routed
0072 from an individual stream (the third PCM such as hw:0,2) instead of
0073 the primary stream. In the case the headphone DAC is shared with a
0074 side or a CLFE-channel DAC, the DAC is switched to the headphone
0075 automatically.
0076
0077 Loopback Mixing
0078 An enum control to determine whether the analog-loopback route is
0079 enabled or not. When it's enabled, the analog-loopback is mixed to
0080 the front-channel. Also, the same route is used for the headphone
0081 and speaker outputs. As a side-effect, when this mode is set, the
0082 individual volume controls will be no longer available for
0083 headphones and speakers because there is only one DAC connected to a
0084 mixer widget.
0085
0086 Dynamic Power-Control
0087 This control determines whether the dynamic power-control per jack
0088 detection is enabled or not. When enabled, the widgets power state
0089 (D0/D3) are changed dynamically depending on the jack plugging
0090 state for saving power consumptions. However, if your system
0091 doesn't provide a proper jack-detection, this won't work; in such a
0092 case, turn this control OFF.
0093
0094 Jack Detect
0095 This control is provided only for VT1708 codec which gives no proper
0096 unsolicited event per jack plug. When this is on, the driver polls
0097 the jack detection so that the headphone auto-mute can work, while
0098 turning this off would reduce the power consumption.
0099
0100
0101 Conexant codecs
0102 ---------------
0103
0104 Auto-Mute Mode
0105 See Realtek codecs.
0106
0107
0108 Analog codecs
0109 --------------
0110
0111 Channel Mode
0112 This is an enum control to change the surround-channel setup,
0113 appears only when the surround channels are available.
0114 It gives the number of channels to be used, "2ch", "4ch" and "6ch".
0115 According to the configuration, this also controls the
0116 jack-retasking of multi-I/O jacks.
0117
0118 Independent HP
0119 When this enum control is enabled, the headphone output is routed
0120 from an individual stream (the third PCM such as hw:0,2) instead of
0121 the primary stream.
