[LAU] Steinberg UR22 error -5 after patching

As some other users I'm trying to get the Steinberg/Yamaha UR22 to work. I added Clemens' patch to quirks-table.h and compiled a new kernel (although I noticed later that patching alsa sources and creating a package should've been enough?). The USB LED on the card now stopped blinking after booting just as it does on windows as soon as I installed the drivers there, but still it is not recognized as a (working) sound card. dmesg output is: [ 7803.974700] snd-usb-audio: probe of 1-2:1.0 failed with error -5 [ 7803.994164] snd-usb-audio: probe of 1-2:1.1 failed with error -5 [ 7803.994182] usbcore: registered new interface driver snd-usb-audio I tried to disable onboard/HMDI sound devices, which did not help. (onboard via BIOS and modprobe.d conf) Does anyone have an idea what could help to do next? Patrick