linux-kernel - Re: [REGRESSION] Distorted sound on Acer Aspire A115-31 laptop

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Message-ID: <a1c2d1e1-4180-48a9-a5c4-7a04feef97c8@gmail.com>
Date: Sun, 22 Dec 2024 09:26:19 +0200
From: Evgeny Kapun <abacabadabacaba@...il.com>
To: Kailang <kailang@...ltek.com>,
 Linux Sound Mailing List <linux-sound@...r.kernel.org>
Cc: Takashi Iwai <tiwai@...e.de>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 Linux Regressions Mailing List <regressions@...ts.linux.dev>,
 Linux Stable Mailing List <stable@...r.kernel.org>
Subject: Re: [REGRESSION] Distorted sound on Acer Aspire A115-31 laptop

 > Headphone or Headset. Which did you use?
 > I don't know your platform has headset mic support or not.

I use headphones (no mic). I suppose my laptop should support a mic, 
because there is an icon next to the headset socket which shows a 
headset with a mic.

 > Could you record sound via headphone?
 >
 > I want to know how the voice distortion.

I've run some experiments to determine the nature of the distortions, 
and I found that on affected kernels, what I'm hearing is the difference 
between the left and the right channel of what is playing. So, if I play 
a mono sound, I hear nothing at all (or rather, almost nothing). If I 
manually mute one of the channels, I hear the sound normally (through 
both ears, while on older kernels muting individual channels actually 
works). If I invert one of the channels, I hear the sound normally as 
well. If I play a stereo sound (for example, a music track), I hear 
distortions.