[alsa-devel] USB Audio Interface / Denon MC7000 and MC8000 controller

[Tobias]

Hello dear ALSA developers.

I have purchased a MC7000 controller in order to control MIXXX on Ubuntu 
16.04. According to the Denon specification the controller should have 
been class compliant but there is an issue with the Audio interface to 
work properly giving following message ...

$ dmesg
...
|[   74.522831] usb 1-1.3: new high-speed USB device number 6 using xhci_hcd
[   74.623784] usb 1-1.3: New USB device found, idVendor=15e4, 
idProduct=8004
[   74.623789] usb 1-1.3: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[   74.623793] usb 1-1.3: Product: DENON DJ MC7000
[   74.623796] usb 1-1.3: Manufacturer: DENON DJ
[   74.623798] usb 1-1.3: SerialNumber: 201603
[   74.625134] usb 1-1.3: clock source 65 is not valid, cannot use

"|||clock source 65 is not valid, cannot use" is repeated uncountable 
times then


|I found a discussion here for the MC8000 Audio interface which was not 
working and showing the same error message:

https://alsa-user.narkive.com/2tDAO87f/troubleshooting-new-usb-audio-device#post8

The solution was to change sound/usb/clock.c and recompile the kernel.
This is not practical for daily use case so I would like to ask if the 
ALSA team could possibly find a permanent fix for ordinary users.

To get my outputs for

aplay -l
aplay -L
|||aplay -D plughw:CARD=MC7000,DEV=0 Grimmaldika-MakeBelieve.wav
|lsusb -v
mixxx --controllerDebug||
JackServer error message|

you may have a look at the Mixxx Community Forums here(just on page, you 
don't need to find and read on multiple pages)

https://www.mixxx.org/forums/viewtopic.php?f=7&t=12962&start=10

If you need any more information then please let me know.

Thanks a lot for your support on this matter.

Cheers!
OsZ
||