On Sat, 22 Apr 2023 18:10:21 +0200, Oswald Buddenhagen wrote: > > It's multi, not mono/stereo. > > AFAICT, this doesn't do anything in the kernel. ... but those values are read by user-space. > Also, I think the subclass is meaningless for devices with just one > stream, but whatever. Again, the value is read by user-space. So changing both have clear influence on the user-space program, and unless you have to change this for fixing a real bug (and there is no other way), this is too risky. IOW, too late to change, we have to accept those values. thanks, Takashi