[LAD] jackd and usb hub

Robin Gareus robin at gareus.org
Sat Oct 9 10:34:01 UTC 2010

On 10/09/10 11:40, Luis Garrido wrote:
> Has someone else here managed to successfully run jack over USB audio
> through an external hub?

Hi Luis,

I'm just trying this and it works. jackd at 48k*1024*3 produces
occasional x-runs which it otherwise does not.

Jackd even starts up with 48k*64*3 and runs a freeverb in->out with no
x-run! 5mins at the time of writing this email.

Laptop-USB -> Hub (old USB1.1) -> UA-25

#lsusb -t:
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 1: Dev 8, If 0, Class=hub, Driver=hub/4p, 12M
        |__ Port 3: Dev 9, If 0, Class=vend., Driver=snd-usb-audio, 12M
        |__ Port 3: Dev 9, If 1, Class=vend., Driver=snd-usb-audio, 12M
        |__ Port 3: Dev 9, If 2, Class=vend., Driver=snd-usb-audio, 12M

#uname -a
Linux soyuz #1 SMP PREEMPT RT Fri Sep 17 04:25:08 CEST
2010 i686 GNU/Linux

#cat /etc/debian_version

#jackd --version
jackdmp 1.9.6

on a 3 1/2 year old Thinkpad X60s.

I had a PCMCIA USB2 card but I gave that away to a friend, sorry I can
not test this at the moment.

have a nice weekend,

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