https://bugzilla.kernel.org/show_bug.cgi?id=86351
--- Comment #29 from Andy Furniss (adf.lists@gmail.com) --- I tried with jack and it works - so I have another workaround.
It accesses alsa like -
cat /proc/asound/card*/pcm3p/sub0/hw_params access: MMAP_INTERLEAVED format: S16_LE subformat: STD channels: 2 rate: 48000 (48000/1) period_size: 1024 buffer_size: 2048