[alsa-devel] Regression in kernel 3.19-rc5 for usb2 scarlett 18i20

[Guido Aulisi]

I will ASAP, now I'm not at home.
IMHO I think this is something about usb than the mixer,
because I didn't use it, I only noticed the xruns even without playing audio.
I didn't try 3.18, because it isn't shipped with fedora yet.

Ciao

2015-01-26 14:04 GMT+01:00 Takashi Iwai <tiwai at suse.de>:
> At Sun, 25 Jan 2015 12:42:22 +0100,
> Guido Aulisi wrote:
>>
>> Hi,
>> I noticed a regression in 3.19-rc5 kernel (as shipped by fedora rawhide)
>> with usb2 focusrite scarlett 18i20.
>> I get a lot of xruns with jack, even at 1024 frame buffer and 2 periods.
>> In 3.17.8 it works quite well without xruns at the same settings.
>>
>> I use a fedora 20 (64bit) laptop with 8GB ram,  I only installed the
>> rawhide kernel to try the new included scarlett mixer, no other software
>> components changed.
>>
>> I can try to do some other test, but compiling the kernel on this laptop
>> is time consuming.
>>
>> Thanks
>> Guido
>
> Looks like a regression in the recent rework for Scarlett devices.
> Chris, do you have any clue?
>
> In anyway, Guido, could you give lsusb -v output (for the relevant
> part)?
>
>
> thanks,
>
> Takashi