Hi, Thank you for your help, as always. I have one question I'd like to ask. It may be basic, but I would appreciate even a simple hint! > > > +static DEVICE_ATTR_RW(check_fault_period); > > Any reason the fault stuff isn't an ALSA control? I'm planning to change it to ALSA control as per the feedback. Could you please let me know how to set the default value for a control? For example, I would like to set it to a value of 60. (For controls with a boolean value, I would like to initialize it with a true value.) Thank you for always providing good advice!