[alsa-devel] snd-usb-audio dying on jackd xruns

[Rods Bobavich]

Clemens,

USB bug. This is exactly what I thought. Here's a tail of the syslog:

Feb  2 11:04:45 studio1 kernel: [  997.880412] ALSA pcm.c:226: setting usb
interface 2:1
Feb  2 11:04:45 studio1 kernel: [  997.889440] ALSA pcm.c:226: setting usb
interface 1:1
Feb  2 11:05:03 studio1 kernel: [ 1015.338527] CE: hpet increased
min_delta_ns to 7500 nsec
Feb  2 11:05:28 studio1 kernel: [ 1040.071773] ALSA urb.c:146: timeout:
still 7 active urbs..
Feb  2 11:05:34 studio1 kernel: [ 1046.070072] ALSA urb.c:146: timeout:
still 2 active urbs..
Feb  2 11:05:56 studio1 kernel: [ 1068.660883] ALSA pcm.c:223: 4:2:1:
usb_set_interface failed

It seems that the error happened about the time of the hpet increase. Do we
have a timer problem?

...Rods ;-)

On Wed, Feb 2, 2011 at 10:33, Clemens Ladisch <clemens at ladisch.de> wrote:

> Rods Bobavich wrote:
> > So I start jackd and it runs fine for a while. Then ALSA crashes and
> > triggers an xrun. Jackd continues to do its merry thing - minus the part
> > about spitting info out to my soundcard...
> >
> > At first I thought this was a Jackd issue but when I looked deeper it
> seems
> > to be ALSA. Once this happens I cannot restart jackd and resume an audio
> > session. In fact, I cannot even rmmod snd-usb-audio. Sometimes I cannot
> > lsusb. So it looks like something is getting seriously hosed!
>
> Looks like a bug in the USB controller driver, probably triggered by some
> unexpected behaviour of your USB controller.
>
> When this happens, are there any error messages in the system log?
>
>
> Regards,
> Clemens
>