Dear Alsa-angels,

I hope I'm posting this to the right place.

I was not able to get my BOSS GT-1 running:

- uname -r 4.14.11-1-ARCH (occured on 4.14.10 as well)

- dmesg ... usb 2-1: Unable to change format on ep #8e: already in use ...

- aplay -l Karte 2: GT1 [GT-1], Gerät 0: USB Audio [USB Audio] Sub-Geräte: 1/1 Sub-Gerät #0: subdevice #0

lsusb output attached

I found a dirty workaround there: https://www.linuxmusicians.com/viewtopic.php?f=6&t=17180&start=30#p8...

I added the USB ID of my device and it works (ALSA, PulseAudio, JACK). This seems to work for the RC-300 loopstation and the Micro BR-80, too.

The affected code was changed with commit ba7c2be114243fa4cfcbc66a81db18e1d55abf4b about 4 years ago.

I only applied a simple patch without knowing what the reason for the other Roland quirks were, so I just wanted to inform you about this issue.

I'm not sure what's missing at the moment, I'm no kernel developer (yet).

Thanks in advance! If you need more info, just tell me.

Regards

Oli