On Mon, 27 Jan 2014 10:05:20 +0100, Andre Majorel wrote > On 2014-01-26 22:55 +0100, Andre Majorel wrote: > [...] > > Tried the Romio II with itself again : it failed as before. > > > > Found a large number of "usb_submit_urb: -22" messages in > > kern.log for yesterday (but none for today). > > If the Romio II is connected directly to the computer, instead > of through a USB hub at the end of a 5-m cable, Is that a USB-1 or a USB-2 device? 5 meters are way above the USB-1 Specs (3m max.). > alsa-midi-latency-test -o 24:0 -i 24:1 > > works fine. > > What are you supposed to do in a case like this ? Get a better > hub ? Get a better MIDI interface ? Work around the problem in > software ? What a mess ! There are some devices that refuse to work with a hub (no matter how short the cable is). My -m-Audio Axiom 61 refuses to connect via a hub - a fact mentioned in the fine manual but _not_ in any promotional material :-( I think this is either a bug in their Usb chip firmware or some engineer tried to be oversmart (i.e. hubs might introduce latency/jitter hence we won't work with hubs). HTH Ralf Mattes > It is a 7-port powered USB hub (Heden HUBUSB7PCB / HUBUSB7PCW). > > -- > André Majorel http://www.teaser.fr/~amajorel/ > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user -- R. Mattes - Hochschule fuer Musik Freiburg rm@xxxxxxxxxxxxxxxxxx _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
