sound/alsa/HD-Audio-Controls.txt

1 This file explains the codec-specific mixer controls.
4 --------------
7   This is an enum control to change the surround-channel setup,
11   jack-retasking of multi-I/O jacks.
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
18   When there are only either headphones or line-out jacks, it gives
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
27   line-outs.
31 -------------------
34   This control enables/disables the analog-loopback circuit.  This
36   (see HD-Audio.txt).  Note that on some codecs the analog-loopback
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.
50 * Mic Jack Mode, Line Jack Mode, etc
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.
58 ----------
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.
69   side or a CLFE-channel DAC, the DAC is switched to the headphone
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
81 * Dynamic Power-Control
82   This control determines whether the dynamic power-control per jack
86   doesn't provide a proper jack-detection, this won't work; in such a
92   the jack detection so that the headphone auto-mute can work, while
97 ---------------
99 * Auto-Mute Mode
104 --------------
107   This is an enum control to change the surround-channel setup,
111   jack-retasking of multi-I/O jacks.