snd-usb-audio dying on jackd xruns

snd-usb-audio dying on jackd xruns

[Rods Bobavich]

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!

It seems to be specific to my machine.

I've tried multiple usb intefaces. All work fine with other computers. I've
tried multiple version of Ubuntu with various versions of ALSA on this
machine. All exhibit the same behavior. I have 3 other machines that run
these interfaces just fine... So it seems to be a
hardware compatibility issue not a software glitch in one version.

I've tried many boot flags but to no avail. I'm at a loss on how to
troubleshoot.

The machine is M4N75TD motherboard with a Phenom II 1055T and the latest
bios flash.

Please advise,

...Rods ;-)

Re: snd-usb-audio dying on jackd xruns

[Clemens Ladisch]

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

Re: 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@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
>