1====================================== 2HD-Audio Codec-Specific Mixer Controls 3====================================== 4 5 6This file explains the codec-specific mixer controls. 7 8Realtek codecs 9-------------- 10 11Channel Mode 12 This is an enum control to change the surround-channel setup, 13 appears only when the surround channels are available. 14 It gives the number of channels to be used, "2ch", "4ch", "6ch", 15 and "8ch". According to the configuration, this also controls the 16 jack-retasking of multi-I/O jacks. 17 18Auto-Mute Mode 19 This is an enum control to change the auto-mute behavior of the 20 headphone and line-out jacks. If built-in speakers and headphone 21 and/or line-out jacks are available on a machine, this controls 22 appears. 23 When there are only either headphones or line-out jacks, it gives 24 "Disabled" and "Enabled" state. When enabled, the speaker is muted 25 automatically when a jack is plugged. 26 27 When both headphone and line-out jacks are present, it gives 28 "Disabled", "Speaker Only" and "Line-Out+Speaker". When 29 speaker-only is chosen, plugging into a headphone or a line-out jack 30 mutes the speakers, but not line-outs. When line-out+speaker is 31 selected, plugging to a headphone jack mutes both speakers and 32 line-outs. 33 34 35IDT/Sigmatel codecs 36------------------- 37 38Analog Loopback 39 This control enables/disables the analog-loopback circuit. This 40 appears only when "loopback" is set to true in a codec hint 41 (see HD-Audio.txt). Note that on some codecs the analog-loopback 42 and the normal PCM playback are exclusive, i.e. when this is on, you 43 won't hear any PCM stream. 44 45Swap Center/LFE 46 Swaps the center and LFE channel order. Normally, the left 47 corresponds to the center and the right to the LFE. When this is 48 ON, the left to the LFE and the right to the center. 49 50Headphone as Line Out 51 When this control is ON, treat the headphone jacks as line-out 52 jacks. That is, the headphone won't auto-mute the other line-outs, 53 and no HP-amp is set to the pins. 54 55Mic Jack Mode, Line Jack Mode, etc 56 These enum controls the direction and the bias of the input jack 57 pins. Depending on the jack type, it can set as "Mic In" and "Line 58 In", for determining the input bias, or it can be set to "Line Out" 59 when the pin is a multi-I/O jack for surround channels. 60 61 62VIA codecs 63---------- 64 65Smart 5.1 66 An enum control to re-task the multi-I/O jacks for surround outputs. 67 When it's ON, the corresponding input jacks (usually a line-in and a 68 mic-in) are switched as the surround and the CLFE output jacks. 69 70Independent HP 71 When this enum control is enabled, the headphone output is routed 72 from an individual stream (the third PCM such as hw:0,2) instead of 73 the primary stream. In the case the headphone DAC is shared with a 74 side or a CLFE-channel DAC, the DAC is switched to the headphone 75 automatically. 76 77Loopback Mixing 78 An enum control to determine whether the analog-loopback route is 79 enabled or not. When it's enabled, the analog-loopback is mixed to 80 the front-channel. Also, the same route is used for the headphone 81 and speaker outputs. As a side-effect, when this mode is set, the 82 individual volume controls will be no longer available for 83 headphones and speakers because there is only one DAC connected to a 84 mixer widget. 85 86Dynamic Power-Control 87 This control determines whether the dynamic power-control per jack 88 detection is enabled or not. When enabled, the widgets power state 89 (D0/D3) are changed dynamically depending on the jack plugging 90 state for saving power consumptions. However, if your system 91 doesn't provide a proper jack-detection, this won't work; in such a 92 case, turn this control OFF. 93 94Jack Detect 95 This control is provided only for VT1708 codec which gives no proper 96 unsolicited event per jack plug. When this is on, the driver polls 97 the jack detection so that the headphone auto-mute can work, while 98 turning this off would reduce the power consumption. 99 100 101Conexant codecs 102--------------- 103 104Auto-Mute Mode 105 See Reatek codecs. 106 107 108Analog codecs 109-------------- 110 111Channel Mode 112 This is an enum control to change the surround-channel setup, 113 appears only when the surround channels are available. 114 It gives the number of channels to be used, "2ch", "4ch" and "6ch". 115 According to the configuration, this also controls the 116 jack-retasking of multi-I/O jacks. 117 118Independent HP 119 When this enum control is enabled, the headphone output is routed 120 from an individual stream (the third PCM such as hw:0,2) instead of 121 the primary stream. 122