Subject: Re: [linux-audio-user] edirol um-880 configuration help needed
From: Chris Pickett (chris.pickett_AT_mail.mcgill.ca)
Date: Thu May 20 2004 - 01:36:45 EEST
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
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