linux-kernel - Re: Logitech webcam USB audio breakage during the 4.10 merge window

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Date:   Sun, 25 Feb 2018 10:45:17 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     "Marius Cirsta" <mforce2@...il.com>
Cc:     <linux-kernel@...r.kernel.org>, <nx.or.die@...il.com>,
        <gregkh@...uxfoundation.org>
Subject: Re: Logitech webcam USB audio breakage during the 4.10 merge window

On Sun, 25 Feb 2018 02:53:15 +0100,
Marius Cirsta wrote:
> 
>  I have a problem that was previously reported here:
> 
> https://www.spinics.net/lists/linux-usb/msg156999.html
> 
>  It seems that with the 4.10-rc1 kernel a regression was introduced
> that makes my Logitech C310 microphone record a distorted ( chipmunk )
> sound. With the 4.9.1 kernel it works perfectly.
> 
>  Immediately after I plug it into the USB port all is fine but after a
> few minutes this problem occurs.
> 
>  Also if add this the kernel cmd line :  usbcore.autosuspend=-1  it
> also works fine.
> 
>  One other thing that I've noticed is that if I make the sampling rate
> 22K it again works fine so only the 44K and 48K sampling rates have
> this problem but unfortunately those are the default that Chromium for
> instance uses ( it gets them from pulseaudio )
> 
> 
> Let me know if you need any more details or testing.

Well it's an old topic, so I don't remember, but did you try to revert
the commit fd1a5059610c as already suggested?

If it doesn't give any difference, it's not about USB-audio driver
side, rather likely some change in USB core.


Takashi