Functionality of pcm_notify in snd-aloop?

Hi,

Please how is the module params pcm_notify supposed to be used, to do what the documentation says: Break capture when PCM format/rate/channels changes?

Breaking capture side operation when the playback side changes the params is very useful, but I cannot find a way to use this param properly. When the capture side is open, the playback side cannot use a different parameter than the one currently used by the capture side (the configuration space is limited) - how can the param be changed then?

Thanks a lot for help.

Best regards,

Pavel.