> From: Paul Eggleton > > On Sunday 14 April 2013 15:49:12 Paul D. DeRocco wrote: > > I've built core-image-base-cedartrail-nopvr, which includes > > ALSA. /dev/snd > > properly contains the devices for my mobo, and > > /proc/asound/devices lists > > them as well. If I plug in a USB MIDI device (a USB to MIDI > > converter), I > > see the USB connect message on the console, but no device > > is added to > > /dev/snd or /proc/asound/devices. Anyone have any idea why? > > I've tried an > > eMu XMidi1x1, and a cheap generic converter. Both work fine > > under Ubuntu, on > > the same mobo. > > Typically two things are required for a USB device to work - > a driver, and an > appropriate udev rule to associate the driver with the > device. Do you have USB > midi support enabled in the kernel? If so, is there a udev > rule for USB midi > devices? If there isn't, presumably you could just use Ubuntu > as a reference > for that.
I apologize for my ignorance, but I really don't know how to go about figuring this out. There is a file called /lib/udev/rules.d/60-persistent-alsa.rules, which is full of cryptic stuff that I don't understand, including two lines referring to usb, but nothing specifically about MIDI. I compared it to the file on Ubuntu, and it's similar but not the same, but I have no idea whether any of the differences are meaningful. They're both small, so I've attached them. Also, I see that while the alsa-utils recipe is being built, the resulting image only seems to have a couple of alsa utilities: alsamixer and alsactl, even though there are a whole lot more listed in meta/recipes-multimedia/alsa/alsa-utils_1.0.25.bb. And when I run the system, there is no /dev/snd/seq device, which is the main interface to all MIDI devices. I don't plan on using that, preferring to use the /dev/snd/midi* OSS emulation device which is supposed to appear when an individual device is connected, but that's not happening, either. How do I find out if USB MIDI support is enabled in the kernel? This is plain vanilla core-image-base-cedartrail-nopvr, without any modifications. ALSA is part of it. Isn't it supposed to just work? -- Ciao, Paul D. DeRocco Paul mailto:pdero...@ix.netcom.com
60-persistent-alsa.rules.Yocto
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60-persistent-alsa.rules.Ubuntu
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