On Wed, Oct 13, 2010 at 2:02 PM, Robin Gareus <[email protected]> wrote: > With the USB2 hub I also get > ALSA urb.c:856: cannot submit datapipe for urb 0, error -28: not enough > bandwidth > ALSA midi.c:214: urb status -32 > messages and jackd won't start.
Does the hub cause this problem also through a regular USB port (not PCMCIA)? > 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 > that? Believe it or not, that combination hadn't crossed my mind yet: using the brand new shiny and otherwise useless hub as a 16 € glorified 5V regulator between its power supply and the PCMCIA card. Why the heck not, eh? One fewer layer, too. Well, there's my workaround, thanks Mr. Gareus! But (it couldn't have been that easy, could it?) only works on one of the two USB/PCMCIA ports. Trying to use the other one gets me this nice message: ALSA sound/usb/usbaudio.c:1348: 40:1:1: usb_set_interface failed Bleh. Anyone interested in a moderately used Edirol UA-25 interface with some occasional -74 dB noise at 13.1 kHz, and a penchant for serial (bus) killing? Anyway, I think this hub issue is worth looking into. Old USB 1.1 hubs don't mess with realtime audio and new USB 2.0 do? Now that's not exactly what I'd call an improvement. What can we expect from USB 3.0? Cheers, L _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
