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@xxxxxxx> 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 >
