root@cm-x270:~$ arecord test.wav
Recording WAVE 'test.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
ALSA lib pcm.c:872:(snd_pcm_sw_params) params->avail_min is 0
arecord: set_params:1012: unable to install sw params:
start_mode: DATA
xrun_mode: STOP
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 0
xfer_align: 1075261880
silence_threshold: 0
silence_size: 0
boundary: 2097152000