[LAD] jackd and usb hub

Robin Gareus robin at gareus.org
Wed Oct 13 12:02:26 UTC 2010

On 10/13/10 08:58, Luis Garrido wrote:
>> PS. Did you have luck with your UA-25?
> Nothing new, I am waiting to get my hands on different hubs to see if
> there is any difference.

There is. I just got my hands on both a USB2 hub and a PCMCIA [1] card.

With the USB2 hub I also get
ALSA urb.c:856: cannot submit datapipe for urb 0, error -28: not enough
ALSA midi.c:214: urb status -32
messages and jackd won't start.

but connecting the UA-25 directly to the PCMCIA/USB2 card works if I
also connect some external power supply to the PCMCIA card. Did you try

It also still works with an old USB1.1 hub.


[1] it's some cheap mycom thingy which shows up as

16:00.0 USB Controller: NEC Corporation USB (rev 41)
16:00.1 USB Controller: NEC Corporation USB (rev 41)
16:00.2 USB Controller: NEC Corporation USB 2.0 (rev 02)

Subsystem: 1033:0035 (ohci_hcd) and
Subsystem: 13e6:1201 (ehci_hcd)

More information about the Linux-audio-dev mailing list