That patch worked perfectly for both devices I noticed the issue on (the Roland INTEGRA-7 and R-26). Although unrelated, I think the other issue with the EIDROL UA-101 in full speed mode (USB 1.1) is new since trying the 5.12.0-rc8-next-20210422 kernel branch. Prior to that, I'd been continually patching updates to the mainline 5.11.9 source. Thanks again, Takashi!, Lucas
