My Geek Out USB sound card (Bus 003 Device 005: ID 2522:0007 LH Labs Geek Out HD Audio 1V5) fails to initialise on all recent debian-provided kernels:
usb 3-6: uac_clock_source_is_valid(): cannot get clock validity for id 41
usb 3-6: clock source 41 is not valid, cannot use
usb 3-6: 1:0: usb_set_interface failed (-71)
Booting into linux-image-5.10.0-8-amd64 fixes this, and the card works as expected. The exact spot where the problem was introduced is unclear; the
issue is present in linux-image-5.14.0-trunk-amd64 and all more recent kernels. Kernels between 5.10.0-8 and 5.14.0-trunk were not tested.