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

[Gong S.]

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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.
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.
The configuration can be found in the attachment.
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