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

[Takashi Iwai]

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