[TAG] USB MIDI

[Bob van der Poel]

Just to follow up on this ... I have it working perfectly now. A few 
fellows on the ALSA mailing list gave me hand and found out that for 
some reason the OSS sound stuff was being loaded and then the ALSA was 
ignored (still, I don't see why a cold plug did work). But, the simple 
solution was to delete or rename the kernel module "usb-midi.ko.gz" so 
that the system can't find it. Works like a damn.


Bob van der Poel wrote:
> 
> Hmmm, we might be getting somewhere ... another reboot, another test.
> 
> 
> Thomas Adam wrote:
>> On Sat, Dec 10, 2005 at 04:21:48PM -0700, Bob van der Poel wrote:
>>> /proc/asound/cards). But, the device is NOT there to use. Trying to
>>> use it generates an error; and 'aconnect' doesn't show it.
>>
>> What error?
>>
> 
> bob$ aplaymidi -p72 midifile.mid
> Cannot connect to port 72:0 - Invalid argument
> 
> Not the most helpful :( But, the port isn't there, so it makes sense.
> 
>>> However, plugging the unit in/out again shows it up.
>>>
>>> I'm wondering if a modprobe to something might force a registration. I
>>> did try 'modprobe usb-midi' but no results there.
>>
>> No results where?  modprobe, if it is successful won't return any
>> output.  It's 'lsmod' that will help you here.
> 
> I was hoping that modprobe might reset something?
> 
> Okay, doing a lsmod before and after the little guy is working does show 
> up something which might point to the problem:
> 
> Before a plugin/out (after boot) we have:
> 
> soundcore               7008  2 snd,usb_midi
> usbcore               108348  7
>          snd_usb_audio,snd_usb_lib,usb_midi,usblp,ehci_hcd,uhci_hcd
> 
> Afterwards, there is an additional line:
> 
> audio                  44032  0
> 
> And the others have changed to:
> 
> soundcore               7008  3 audio,snd,usb_midi
> usbcore               108348  8
>         audio,snd_usb_audio,snd_usb_lib,usb_midi,usblp,ehci_hcd,uhci_hcd
> 
> Really, just the difference in all this is that the 'audio' module has 
> been added.
> 
> Also, there is a file /proc/asound/cards which does not change between 
> no-work and work:
> 
> cat /proc/asound/cards
> 0 [AudioPCI       ]: ENS1371 - Ensoniq AudioPCI
>                      Ensoniq AudioPCI ENS1371 at 0xec00, irq 10
> 1 [Interface      ]: USB-Audio - USB Uno MIDI Interface
>                      M-Audio USB Uno MIDI Interface at
>    usb-0000:00:10.1-1, full speed
> 
> 
> Finally, the file /proc/asound/card1/midi0 has changed from being an 
> empty file to:
> 
> bob$ cat midi0
> USB Uno MIDI Interface
> 
> Output 0
>   Tx bytes     : 197
> Input 0
>   Rx bytes     : 0
> 
> 
> More thoughts?
> 

-- 
Bob van der Poel ** Wynndel, British Columbia, CANADA **
EMAIL: bvdp at uniserve.com
WWW:   http://mypage.uniserve.com/~bvdp