[Pkg-alsa-devel] Bug#912824: Bug#912824: Distorted sound with some headphones.

Elimar Riesebieter riesebie at lxtec.de
Sun Nov 4 07:56:45 GMT 2018

* Gong S. <pthfdr at protonmail.ch> [2018-11-04 05:42 +0000]:

> Package: alsa-utils Version: 1.1.7-1
> With some headphones and earphones, the sound output is distorted,
> e.g. the left and right channels are swapping constantly, this
> issue is especially serious with human speech.  I used a Sony
> MDR-AS800AP earphone directly inserted to the sound card's audio
> output, the sound is distorted. However, if I hold the button on
> the earphone the output is normal but at a higher volume.

What happens if you decrease volume by alsamixer?

> I can confirm that the earphone and the sound card have no problem
> because it plays normally on an Android smartphone or on
> dual-booted Windows. The problem is certainly in ALSA.  I also
> tested with other earphones, some of them have similar problems.
> Some earphones have an "Android/Apple" switch, and the distortion
> happens when the switch is set to "Apple".  I am using ALSA
> directly without PulseAudio or other Poetterware.

Are you sure? Distortion happens when the volume is increased to
more that 100% in i.e. pavucontrol.
> The configuration can be found in the attachment.

Thanks for reporting

  Numeric stability is probably not all that
  important when you're guessing;-)
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