Fernando Pablo Lopez-Lezcano wrote: > After the reboot is done I conect the MidiSport 2x2 usb MIDI > interface. Hotplug recognizes the card, fxload loads the > firmware, the interface disconnects and reconnects, hotplug > recognizes that and loads snd-usb-audio (both "audio" and > "usb-midi" have been blacklisted). And that's it. With no > extra configuration snd-usb-audio is not automatically loading > snd-usb-midi (bug?). So I go ahead and load snd-usb-midi by > hand.
snd-usb-midi should be loaded when you try to access the sequencer device. "aconnect -o" or trying to play/record something usually does the job. I think I have observed a similar bug when snd-usb-audio is already loaded for another device without MIDI, but this isn't the case here. > Sending midi from a keyboard makes the Midi IN LED blink (so the midi > bytes are getting to the interface) but I see no activity in the > program (which should be showing the midi bytes being received). > Checking /proc/asound/card1/midi0 I can see that Output 0 has a > non-zero value of "Tx bytes", but Input O has received nothing. Same > with Muse which uses the native alsa interface. > > So everything seems to indicate things are working but > nothing is received by the programs and alsa. Please try the seq program in the alsa-lib/test directory to see whether the sequencer device works. "./seq decoder 72.0" will show incoming events. > So I say, let's try the oss drivers. > > I unload all the alsa modules related with the second card > (which is the MidiSport). After that I load both "audio" and > "usb-midi", they say they recognize the card and they set up > two interfaces, /dev/midi00 and /dev/midi01. Trying to use pd > gets the same results, output works, input does not. Neither driver working may indicate some problem with the 2x2 firmware. Try using some other version. > Now I get curious and say, what if I load the alsa usb midi > modules? (I know I should not be doing this!) So I go ahead > and load snd-usb-audio and then snd-usb-midi, to my surprise > they load (I would imagine they would refuse to load because > the other driver is using the midi interface hardware): Please compare /proc/bus/usb/devices before and after. It really should not be possible to replace a driver already connected to the device. > Sep 16 15:42:06 nando kernel: snd-usb-midi: MIDIStreaming version 01.00 > Sep 16 15:42:06 nando kernel: snd-usb-midi: detected 2 output jack(s) on endpoint 1 > Sep 16 15:42:06 nando kernel: snd-usb-midi: detected 2 input jack(s) on endpoint 1 > Sep 16 15:42:06 nando kernel: ALSA ../alsa-kernel/core/rawmidi.c:1425: unable > to register OSS rawmidi device 1:0 > Sep 16 15:42:06 nando kernel: snd-usb-midi: endpoint 1: created 2 output and 2 > input ports > > Note that they cannot register the device (because usb-midi is > using it?) but the drivers stay loaded and seem to create the > endpoints. The OSS devices cannot be registered. The ALSA rawmidi and sequencer devices should work. > If I try to start pd things keep working (midi in > does not work, of course), but I get some errors (not > surprising): > > Sep 16 15:42:48 nando kernel: usb-uhci.c: ENXIO c0008580, flags 0, urb > deebaea0, burb defc3ce0 > Sep 16 15:42:48 nando kernel: usbmidi: Cannot submit urb for MIDI-IN > Sep 16 15:43:31 nando kernel: usb-uhci.c: ENXIO c0008580, flags 0, urb > deebaea0, burb defc3ce0 > Sep 16 15:43:31 nando kernel: usbmidi: Cannot submit urb for MIDI-IN usb-midi complains because snd-usb-midi has already submitted an urb. This is to be expected in this situation. > So I unload all modules, both alsa and oss versions dealing > with the MidiSport. They unload cleanly. > > The I load snd-usb-audio and snd-usb-midi _again_. They load. > > If I start pd I get a kernel oops: I think something got out of whack when two drivers tried to handle the same device simultaneously. > Is there anything else I could test? Try to see what happens if you plug/unplug 50 times in 10 seconds. ;-) Regards, Clemens ------------------------------------------------------- Sponsored by: AMD - Your access to the experts on Hammer Technology! Open Source & Linux Developers, register now for the AMD Developer Symposium. Code: EX8664 http://www.developwithamd.com/developerlab _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
