On Tue, 03 Jan 2023 16:14:57 +0100, Michael Ralston wrote: > > On Wed, 4 Jan 2023 at 02:13, Takashi Iwai <tiwai@xxxxxxx> wrote: > > > > That's weird. Is snd_usb_audio driver bound with the device at all? > > That is, does it appear in /proc/asound/cards? > > > > Yes, it's there. > > 0 [V49 ]: USB-Audio - V49 > Alesis V49 at usb-0000:08:00.1-3, full speed > 1 [NVidia ]: HDA-Intel - HDA NVidia > HDA NVidia at 0xfc080000 irq 154 > 2 [U192k ]: USB-Audio - UMC404HD 192k > BEHRINGER UMC404HD 192k at usb-0000:08:00.1-4, high speed > 3 [Generic ]: HDA-Intel - HD-Audio Generic > HD-Audio Generic at 0xfca00000 irq 156 Hrm... Try to reload snd_usb_audio module with the dyndbg=+p option, e.g. # modprobe -r snd-usb-audio # modprobe snd_usb_audio dyndbg=+p Or you can try to put your own debug printk(); we need to make sure whether it's really the right code you're testing at first. Takashi
