On 2014-01-26 22:55 +0100, Andre Majorel wrote: > On 2014-01-26 14:56 +0100, Clemens Ladisch wrote: > > > What happens if you try two loopbacks at the same time, from the > > Romio to another device, and from another device to the Romio? > > Tried three combinations of one alsa-midi-latency-test process > writing to one Romio II port and another reading from another > Romio II port : > > alsa-midi-latency-test -o 24:0 -i 28:7 & > alsa-midi-latency-test -o 28:7 -i 24:0 > > alsa-midi-latency-test -o 24:0 -i 28:7 & > alsa-midi-latency-test -o 28:7 -i 24:1 > > alsa-midi-latency-test -o 24:1 -i 28:7 & > alsa-midi-latency-test -o 28:7 -i 24:1 > > They all worked without a hitch. > > 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, 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 ! 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
