blob: e9621e349e1732b7d7dc75e2829b37f952f5a597 [file] [log] [blame]
Takashi Iwai737c2652011-07-19 09:34:10 +02001This file explains the codec-specific mixer controls.
2
3Realtek 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
30IDT/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
57VIA 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
96Conexant codecs
97---------------
98
99* Auto-Mute Mode
100 See Reatek codecs.
Raymond Yauce662bb2011-10-04 09:46:44 +0800101
102
103Analog 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.