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

[Evgeny Kapun]

> 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.