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[Bug 1540372] Re: [Intel DP35DP, SigmaTel STAC9271D, Green Speaker, Rear] Underruns, dropouts or crackling sound


one more thing

getting back to this

I cant find any Hint String with key loopback

Hint Strings
The codec parser have several switches and adjustment knobs for
matching better with the actual codec or device behavior.  Many of
them can be adjusted dynamically via "hints" strings as mentioned in
the section above.  For example, by passing `jack_detect = no` string
via sysfs or a patch file, you can disable the jack detection, thus
the codec parser will skip the features like auto-mute or mic
auto-switch.  As a boolean value, either `yes`, `no`, `true`, `false`,
`1` or `0` can be passed.

The generic parser supports the following hints:

- 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
- 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
- pcm_format_first (bool): sets the PCM format before the stream tag
  and channel ID
- sticky_stream (bool): keep the PCM format, stream tag and ID as long
  as possible; default true
- spdif_status_reset (bool): reset the SPDIF status bits at each time
  the SPDIF stream is set up
-  pin_amp_workaround (bool): the output pin may have multiple amp
- single_adc_amp (bool): ADCs can have only single input amps
- auto_mute (bool): enable/disable the headphone auto-mute feature;
  default true
- auto_mic (bool): enable/disable the mic auto-switch feature; default
- line_in_auto_switch (bool): enable/disable the line-in auto-switch
  feature; default false
- need_dac_fix (bool): limits the DACs depending on the channel count
- primary_hp (bool): probe headphone jacks as the primary outputs;
  default true
- multi_io (bool): try probing multi-I/O config (e.g. shared
  line-in/surround, mic/clfe jacks)
- multi_cap_vol (bool): provide multiple capture volumes
- inv_dmic_split (bool): provide split internal mic volume/switch for
  phase-inverted digital mics
- indep_hp (bool): provide the independent headphone PCM stream and
  the corresponding mixer control, if available
- add_stereo_mix_input (bool): add the stereo mix (analog-loopback
  mix) to the input mux if available
- add_jack_modes (bool): add "xxx Jack Mode" enum controls to each
  I/O jack for allowing to change the headphone amp and mic bias VREF
- power_save_node (bool): advanced power management for each widget,
  controlling the power sate (D0/D3) of each widget node depending on
  the actual pin and stream states
- power_down_unused (bool): power down the unused widgets, a subset of
  power_save_node, and will be dropped in future
- add_hp_mic (bool): add the headphone to capture source if possible
- hp_mic_detect (bool): enable/disable the hp/mic shared input for a
  single built-in mic case; default true
- mixer_nid (int): specifies the widget NID of the analog-loopback

Could you advice please

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  [Intel DP35DP, SigmaTel STAC9271D, Green Speaker, Rear] Underruns,
  dropouts or crackling sound

Status in alsa-driver package in Ubuntu:

Bug description:
  I cant record or play on my sound card ubuntu 14.04.1

  Alsa is detecting the sound card
  **** List of PLAYBACK Hardware Devices ****
  card 0: Intel [HDA Intel], device 0: STAC9271D Analog [STAC9271D Analog]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: Intel [HDA Intel], device 1: STAC9271D Digital [STAC9271D Digital]
    Subdevices: 1/1
    Subdevice #0: subdevice #0

  but PulseAudio is not detecting the card 

  attached the log file

  Thank you

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-47.53~14.04.1-generic 3.19.8-ckt10
  Uname: Linux 3.19.0-47-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
   /dev/snd/controlC0:  tuned      1851 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Feb  1 15:09:35 2016
  InstallationDate: Installed on 2015-10-26 (98 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel failed
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_Jack: Green Speaker, Rear
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [, SigmaTel STAC9271D, Green Speaker, Rear] Underruns, dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/02/2007
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: DPP3510J.86A.0293.2007.1002.1519
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: DP35DP
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAD81073-207
  dmi.chassis.type: 2
  dmi.modalias: dmi:bvnIntelCorp.:bvrDPP3510J.86A.0293.2007.1002.1519:bd10/02/2007:svn:pn:pvr:rvnIntelCorporation:rnDP35DP:rvrAAD81073-207:cvn:ct2:cvr:
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2016-01-29T17:09:52.179523

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