Ubuntu – Crackling sound and noise when using line in


I'm receiving sound using the motherboard's "line in" input and I get a lot of "static" and weird noises.

The funny thing is that, when I try to record using arecord test so I can listen to the playback and check if the noises are there, the noise disappears and sound becomes pure…just by executing arecord test.

Any ideas on how to fix this? It's def a software thing. I listened to the audio coming in and it's pure.

Best Answer

Pulseaudio may be the culprit:

Use sudo -H gedit /etc/modprobe.d/alsa-base.conf

Search for:

options snd-hda-intel position_fix=1

and change it to:

options snd-hda-intel position_fix=2

Source: Crackling sound from microphone recently, in 13.04

If you are using TLP:



Timeout (in seconds) for the audio power saving mode (supports Intel HDA, AC97). A value of 0 disables power save.

Hint: this setting can cause slight clicks in sound output.

  • Y – powers off the controller together with the sound chip
  • N – controller active permanently
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