Logitech webcam USB audio breakage during the 4.10 merge window

Logitech webcam USB audio breakage during the 4.10 merge window

[Marius Cirsta]

 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.

Regards,

Marius Cirsta   ,

mforce2@gmail.com

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

[Takashi Iwai]

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

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

[Marius Cirsta]

Hi,

 Thanks for your answer.

 Yes, I tried reverting just that commit on top of kernel 4.15.5 and
there was no change so I too suspect it's something from USB core
related to the quirks that this webcam needs.

Regards,

Marius Cirsta,

mforce2@gmail.com

On Sun, Feb 25, 2018 at 11:45 AM, Takashi Iwai <tiwai@suse.de> wrote:
> 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

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

[Greg KH]

On Thu, Apr 05, 2018 at 07:05:29PM +0300, Marius Cirsta wrote:
> Adding the linux-usb mailing , maybe someone from there will be able
> to help with this.

Can you run 'git bisect' to find the offending patch?

thanks,

greg k-h

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

[Marius Cirsta]

Adding the linux-usb mailing , maybe someone from there will be able
to help with this.

On Sun, Feb 25, 2018 at 12:45 PM, Marius Cirsta <mforce2@gmail.com> wrote:
> Hi,
>
>  Thanks for your answer.
>
>  Yes, I tried reverting just that commit on top of kernel 4.15.5 and
> there was no change so I too suspect it's something from USB core
> related to the quirks that this webcam needs.
>
> Regards,
>
> Marius Cirsta,
>
> mforce2@gmail.com
>
> On Sun, Feb 25, 2018 at 11:45 AM, Takashi Iwai <tiwai@suse.de> wrote:
>> 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