Greetings ALSA community, I recently acquired a Motu M4 interface, and seems to be working well so far. Everyday usage is completely functional. However, I noticed an odd sound artifact that happens from time to time when using DAWs like Ardour and Waveform11. It's a windy, ghostly sound that happens whenever I open any DAWs (the simple act of opening them triggers this). Interestingly, audio apps that use PulseAudio do not suffer from this issue. It's hard to describe it, so I recorded a video reproducing this problem: https://youtu.be/bM8x-YuXLVI A few things I've discovered while trying to understand what's going on: * It only happens with apps that use JACK or ALSA APIs. Using PulseAudio (through PipeWire) does not trigger it. * Seems like this sound is not an artifact of the interface; it appears that this odd sound is sent to the interface through USB. (You can see this in the video.) * It's triggered per track; in the video, for example, the drums and keyboard tracks are affected independetly. I was oriented in #alsa at Freenode that the output of 'alsa-info' might be helpful, so here it is: http://alsa-project.org/db/?f=62f686710cc6c9344a8986707bf3d09248c514d1 (I'm running this on top of a 5.12.5 kernel, which should include this fix: https://bugzilla.kernel.org/show_bug.cgi?id=207023) I'd like to know where should I report this bug (kernel bugzilla?), and if there's any other information I can provide to help fixing it. With respect, Georges
