[linux-audio-user] ALSA/Evolution USB keyboard

[Clemens Ladisch]

Atte André Jensen wrote:
> I can't produce a working .asoundrc myself.

Currently, there isn't much to be configured for MIDI device plugins,
so you don't need an .asoundrc for your keyboard.

> I run debian/unstable so there's no such thing as
> /etc/modules.conf. It's was /etc/modutils/alsa, but now I moved it
> out of the way. Instead I figured I'd start with ~/.asoundrc,
> since I believe they should be the same.

modules.conf has nothing to do with the ~/.asoundrc file. The former
tells modprobe how to load modules and where to find them, the latter
tells ALSA about user-defined plugins.

> But I cannot make *any* program recieve midi from the Evolution
> USB keyboard.
>
> Here's what shows up in /var/log/messages when I plug in the Evolution:
> ...
> Aug 13 23:37:05 aarhus kernel: usb-midi: Found MIDISTREAMING on dev 0a4d:008e, iface 1
> ...
> [atte at aarhus atte]$ cat /proc/asound/cards
> ...
> 1 [keyboard       ]: USB-Audio - MK-249C USB MIDI keyboard
>                      Evolution Electronics Ltd. MK-249C USB MIDI keyboard at usb-0000:00:03.1-2

The log messages are from the OSS usb-midi driver. /proc/asound/cards
shows that ALSA's snd-usb-audio is loaded. You now have two drivers
trying to access the same device.

Please add the following lines to the /etc/hotplug/blacklist file to
prevent the OSS drivers from loading:

audio
usb-midi


HTH
Clemens