| Takashi Iwai | 737c265 | 2011-07-19 09:34:10 +0200 | [diff] [blame] | 1 | This file explains the codec-specific mixer controls. |
| 2 | |
| 3 | Realtek codecs |
| 4 | -------------- |
| 5 | |
| 6 | * Channel Mode |
| 7 | This is an enum control to change the surround-channel setup, |
| 8 | appears only when the surround channels are available. |
| 9 | It gives the number of channels to be used, "2ch", "4ch", "6ch", |
| 10 | and "8ch". According to the configuration, this also controls the |
| 11 | jack-retasking of multi-I/O jacks. |
| 12 | |
| 13 | * Auto-Mute Mode |
| 14 | This is an enum control to change the auto-mute behavior of the |
| 15 | headphone and line-out jacks. If built-in speakers and headphone |
| 16 | and/or line-out jacks are available on a machine, this controls |
| 17 | appears. |
| 18 | When there are only either headphones or line-out jacks, it gives |
| 19 | "Disabled" and "Enabled" state. When enabled, the speaker is muted |
| 20 | automatically when a jack is plugged. |
| 21 | |
| 22 | When both headphone and line-out jacks are present, it gives |
| 23 | "Disabled", "Speaker Only" and "Line-Out+Speaker". When |
| 24 | speaker-only is chosen, plugging into a headphone or a line-out jack |
| 25 | mutes the speakers, but not line-outs. When line-out+speaker is |
| 26 | selected, plugging to a headphone jack mutes both speakers and |
| 27 | line-outs. |
| 28 | |
| 29 | |
| 30 | IDT/Sigmatel codecs |
| 31 | ------------------- |
| 32 | |
| 33 | * Analog Loopback |
| 34 | This control enables/disables the analog-loopback circuit. This |
| 35 | appears only when "loopback" is set to true in a codec hint |
| 36 | (see HD-Audio.txt). Note that on some codecs the analog-loopback |
| 37 | and the normal PCM playback are exclusive, i.e. when this is on, you |
| 38 | won't hear any PCM stream. |
| 39 | |
| 40 | * Swap Center/LFE |
| 41 | Swaps the center and LFE channel order. Normally, the left |
| 42 | corresponds to the center and the right to the LFE. When this is |
| 43 | ON, the left to the LFE and the right to the center. |
| 44 | |
| 45 | * Headphone as Line Out |
| 46 | When this control is ON, treat the headphone jacks as line-out |
| 47 | jacks. That is, the headphone won't auto-mute the other line-outs, |
| 48 | and no HP-amp is set to the pins. |
| 49 | |
| 50 | * Mic Jack Mode, Line Jack Mode, etc |
| 51 | These enum controls the direction and the bias of the input jack |
| 52 | pins. Depending on the jack type, it can set as "Mic In" and "Line |
| 53 | In", for determining the input bias, or it can be set to "Line Out" |
| 54 | when the pin is a multi-I/O jack for surround channels. |
| 55 | |
| 56 | |
| 57 | VIA codecs |
| 58 | ---------- |
| 59 | |
| 60 | * Smart 5.1 |
| 61 | An enum control to re-task the multi-I/O jacks for surround outputs. |
| 62 | When it's ON, the corresponding input jacks (usually a line-in and a |
| 63 | mic-in) are switched as the surround and the CLFE output jacks. |
| 64 | |
| 65 | * Independent HP |
| 66 | When this enum control is enabled, the headphone output is routed |
| 67 | from an individual stream (the third PCM such as hw:0,2) instead of |
| 68 | the primary stream. In the case the headphone DAC is shared with a |
| 69 | side or a CLFE-channel DAC, the DAC is switched to the headphone |
| 70 | automatically. |
| 71 | |
| 72 | * Loopback Mixing |
| 73 | An enum control to determine whether the analog-loopback route is |
| 74 | enabled or not. When it's enabled, the analog-loopback is mixed to |
| 75 | the front-channel. Also, the same route is used for the headphone |
| 76 | and speaker outputs. As a side-effect, when this mode is set, the |
| 77 | individual volume controls will be no longer available for |
| 78 | headphones and speakers because there is only one DAC connected to a |
| 79 | mixer widget. |
| 80 | |
| 81 | * Dynamic Power-Control |
| 82 | This control determines whether the dynamic power-control per jack |
| 83 | detection is enabled or not. When enabled, the widgets power state |
| 84 | (D0/D3) are changed dynamically depending on the jack plugging |
| 85 | state for saving power consumptions. However, if your system |
| 86 | doesn't provide a proper jack-detection, this won't work; in such a |
| 87 | case, turn this control OFF. |
| 88 | |
| 89 | * Jack Detect |
| 90 | This control is provided only for VT1708 codec which gives no proper |
| 91 | unsolicited event per jack plug. When this is on, the driver polls |
| 92 | the jack detection so that the headphone auto-mute can work, while |
| 93 | turning this off would reduce the power consumption. |
| 94 | |
| 95 | |
| 96 | Conexant codecs |
| 97 | --------------- |
| 98 | |
| 99 | * Auto-Mute Mode |
| 100 | See Reatek codecs. |
| Raymond Yau | ce662bb | 2011-10-04 09:46:44 +0800 | [diff] [blame] | 101 | |
| 102 | |
| 103 | Analog codecs |
| 104 | -------------- |
| 105 | |
| 106 | * Channel Mode |
| 107 | This is an enum control to change the surround-channel setup, |
| 108 | appears only when the surround channels are available. |
| 109 | It gives the number of channels to be used, "2ch", "4ch" and "6ch". |
| 110 | According to the configuration, this also controls the |
| 111 | jack-retasking of multi-I/O jacks. |
| 112 | |
| 113 | * Independent HP |
| 114 | When this enum control is enabled, the headphone output is routed |
| 115 | from an individual stream (the third PCM such as hw:0,2) instead of |
| 116 | the primary stream. |