Thanks for the response. I'm running a very recent build of the master kernel tree (~ 5.11-rc2).
I'll give dyndbg a try.
Mike
On Sun, Jan 17, 2021 at 11:43 PM Takashi Iwai tiwai@suse.de wrote:
On Sun, 17 Jan 2021 19:56:01 +0100, Mike Oliphant wrote:
I recently got a NUX MG-300 USB guitar fx interface with high hopes that
it
would work in Linux. It is supposed to be class-compliant, and works in
iOS
and macOS without a driver.
Unfortunately, while it is recognized as a USB audio device by Linux, it
is
not working.
The core issue seems to be that "stream0" reports no playback rates.
dmesg
also shows errors, including "__uac_clock_find_source(): selector
reported
illegal value".
Any help identifying the issue would be much appreciated. I have some experience troubleshooting the USB audio kernel code and am happy to try doing so if I can get a nudge in the right direction.
Output from "stream0", dmesg, and lsusb follows.
Did you try the latest 5.11-rc kernel? There have been lots of changes in USB-audio and this might work better there.
If it still doesn't work with 5.11-rc, please try to enable the debug option, e.g. boot with snd_usb_audio.dyndbg=+p boot option, plug the device, and get the kernel logs (at plugging and during the audio operations).
thanks,
Takashi