Pedro Lopez-Cabanillas wrote: > Chris Pickett wrote: > >>>Clemens Ladisch wrote: >>>>The ALSA driver supports both driver modes. >> >>I tried switching the UM-880 back to the FPT mode, and it works now. I >>don't know if that's a regression, but in any case I'll try out patches >>for you if it's something you want to fix. > > The "generic driver mode" descriptors aren't fully compliant with the USB MIDI > specification, because it doesn't have an AudioControl interface, which is > mandatory. You can say that an AudioControl interface is meaningless here > because the UM-880 has no audio function incorporated, only MIDI. That is > true, but in this case the class-specific AC interface descriptor will only > contain the header descriptor. Did you see a kernel/syslog complain about > "cannot find HEADER" or something like that? No, I just get: usb 1-1: new full speed USB device using address 2 and then nothing works. > The usb-midi OSS driver doesn't look for AC descriptor, so it can handle it. > But as Clemens said, that driver is not supported by Rosegarden. Okay, thanks for the explanation. I put a thread summary on how to get these devices working in the ALSA wiki: http://alsa.opensrc.org/index.php?page=Edirol+UM-550+and+UM-880 Cheers, Chris
