Documentation/sound/hd-audio/controls.rst

   1 ======================================
   2 HD-Audio Codec-Specific Mixer Controls
   3 ======================================
   4
   5
   6 This file explains the codec-specific mixer controls.
   7
   8 Realtek codecs
   9 --------------
  10
  11 Channel 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
  18 Auto-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
  35 IDT/Sigmatel codecs
  36 -------------------
  37
  38 Analog 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
  45 Swap 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
  50 Headphone 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
  55 Mic 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
  62 VIA codecs
  63 ----------
  64
  65 Smart 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
  70 Independent 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
  77 Loopback 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
  86 Dynamic 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
  94 Jack 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
 101 Conexant codecs
 102 ---------------
 103
 104 Auto-Mute Mode
 105   See Reatek codecs.
 106
 107
 108 Analog codecs
 109 --------------
 110
 111 Channel 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
 118 Independent 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.