7.3.4.9 Pin Capabilities
The Pin Capabilities parameter returns a bit field describing the capabilities 
of the Pin Complex Widget.

Output Capable indicates whether the pin complex supports output. If Output 
Capable is a 1, the
pin is capable of output.

Headphone Drive Capable indicates that the pin has an amplifier with sufficient 
current drive to
drive headphones. If Output Capable is a 0, then this bit has no meaning and 
must be 0.

Presence Detect Capable indicates whether the pin complex can perform presence 
detect to
determine whether there is anything plugged in. Presence detect does not 
indicate what is plugged
in, only that something is plugged in.

Trigger Required indicates whether a trigger is required for an impedance 
measurement (see
Section 7.3.3.15).

Impedance Sense Capable indicates whether the pin complex supports impedance 
sense on the
attached peripheral to determine what it is. More accurate (possibly sequenced) 
forms of peripheral
discrimination may be supported independent of this capability; however, if 
this bit is a 1, then the
codec must support at least the basic impedance test as described in Section 
7.3.3.15.


the trigger is required for an impedance measurement but your codec does not 
support Impsense

you can disable it by hint

trigger_sense=0


https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa/HD-Audio.txt

- jack_detect (bool): specify whether the jack detection is available
  at all on this machine; default true
- inv_jack_detect (bool): indicates that the jack detection logic is
  inverted
- trigger_sense (bool): indicates that the jack detection needs the
  explicit call of AC_VERB_SET_PIN_SENSE verb
- inv_eapd (bool): indicates that the EAPD is implemented in the
  inverted logic



Node 0x1b [Pin Complex] wcaps 0x40058f: Stereo Amp-In Amp-Out
  Control: name="Headphone Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Front Headphone Jack", index=0, device=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0001373e: IN OUT HP EAPD Detect Trigger
    Vref caps: HIZ 50 GRD 80 100
  EAPD 0x2: EAPD
  Pin Default 0x02214020: [Jack] HP Out at Ext Front
    Conn = 1/8, Color = Green
    DefAssociation = 0x2, Sequence = 0x0
  Pin-ctls: 0xc0: OUT HP VREF_HIZ
  Unsolicited: tag=01, enabled=1
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0
  Connection: 5
     0x0c 0x0d 0x0e 0x0f 0x26*

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https://bugs.launchpad.net/bugs/874535

Title:
  Volume Slider Jumps, due to rapidly changing hardware jack sense state

Status in “alsa-driver” package in Ubuntu:
  Triaged

Bug description:
  In Oneiric Release,  The volume slider randomly jump down a notch or
  two for fraction of  a second, even when there is no audio playing on
  the system.  If mute is selected, the menu will quickly flip out of
  mute mode and back again.  This change actually affects the audio
  output, resulting in pops correlated with the volume changes.

  nVidia GF106 Audio Controller
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC892 Analog [ALC892 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jfrorie    9959 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfb9f8000 irq 54'
     Mixer name : 'Realtek ALC892'
     Components : 'HDA:10ec0892,1462522c,00100302'
     Controls      : 35
     Simple ctrls  : 20
  Card2.Amixer.info:
   Card hw:2 'Generic'/'HD-Audio Generic at 0xfbcf8000 irq 55'
     Mixer name : 'ATI R6xx HDMI'
     Components : 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 4
     Simple ctrls  : 1
  Card2.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  DistroRelease: Ubuntu 11.10
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  Package: pulseaudio 1:1.0-0ubuntu3.1
  PackageArchitecture: amd64
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
  Tags:  oneiric running-unity
  Uname: Linux 3.0.0-14-generic x86_64
  UpgradeStatus: Upgraded to oneiric on 2011-10-14 (82 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 11/16/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V25.0
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: X58A-GD45 (MS-7522)
  dmi.board.vendor: MSI
  dmi.board.version: 5.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
  dmi.chassis.version: 5.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV25.0:bd11/16/2010:svnMSI:pnMS-7522:pvr5.0:rvnMSI:rnX58A-GD45(MS-7522):rvr5.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr5.0:
  dmi.product.name: MS-7522
  dmi.product.version: 5.0
  dmi.sys.vendor: MSI

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