[alsa-devel] [git pull] [PATCH 0/7] add support for many Roland and Yamaha devices

[Keith A. Milner]

On Friday 09 Aug 2013 15:17:08 Clemens Ladisch wrote:
> Keith A. Milner wrote:
> > I will mention, if it is of any importance, that I get the following when
> > the driver is loaded:
> > 
> > [ 3340.089613] snd-usb-audio: probe of 1-6.2:1.2 failed with error -5
> 
> That looks like the MIDI interface.
> Do you have the MIDI ports (see "amidi -l")?

No MIDI ports show up. Nor are there any on the device or any that I'm aware 
of that are "internal" to the device.

I will note that on the Boss BR-80 there is an "internal" MIDI port which can 
be used as a drum synth. There appears to be nothing similar on the JS-8.

My original quirk actually had an bug as it included a MIDI endpoint 
definition. This originally worked without error, but in later versions it 
started to error in a similar way, I believe because of later changes to snd-
usb.

>From what I can tell, the JS-8 announces a MIDI-like interface, but doesn't 
actually have one.

> Is there any error message in the system log?

Not really. It's pretty uch the same as in dmesg:

Aug  9 15:52:18 KAMDesktop kernel: [ 6374.238016] usb 1-6.2: new high-speed 
USB device number 7 using ehci-pci
Aug  9 15:52:18 KAMDesktop kernel: [ 6374.332853] snd-usb-audio: probe of 
1-6.2:1.2 failed with error -5
Aug  9 15:52:18 KAMDesktop mtp-probe: checking bus 1, device 7: 
"/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-6/1-6.2"
Aug  9 15:52:18 KAMDesktop mtp-probe: bus: 1, device: 7 was not an MTP device
Aug  9 15:52:18 KAMDesktop kernel: [ 6374.365928] Unable to change format on 
ep #84: already in use
Aug  9 15:52:18 KAMDesktop kernel: [ 6374.365944] Unable to change format on 
ep #84: already in use
Aug  9 15:52:18 KAMDesktop kernel: [ 6374.365965] Unable to change format on 
ep #84: already in use
Aug  9 15:52:18 KAMDesktop kernel: [ 6374.366109] Unable to change format on 
ep #84: already in use

Cheers,

Keith