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

[Takashi Iwai]

At Mon, 26 Jan 2015 14:28:14 +0100,
Guido Aulisi wrote:
> 
> 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.

Well, then we might need the git bisection, I'm afraid...


thanks,

Takashi

> 
> 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
>