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737c265b TI |
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. | |
ce662bb2 RY |
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. |