[MinnowBoard] alsa-utils: Unable to record audio using arecord

[Khan, Yasir]

Hello all,

I am trying to record audio using arecord on minnowboard v1 with latest angstrom images downloaded from official mirror from minnowboard.org. The problem is that I am unable to record anything. I have un-muted the mic and set other settings using alsamixer. I am able to play a wav file using aplay but arecord doesn't seem to work. Another team reported that they faced the same issue on another board so chances of wrong setup or damaged hardware are minimal. arecord in verbose mode shows input levels to be 0% at all times. Kindly see my steps below and correct me if I am doing something wrong. Thanks

Below is the log:

####### list of modules loaded ###########
root at minnow:~# lsmod
Module                  Size  Used by
emgd                  576557  5
drm_kms_helper         30448  1 emgd
drm                   214113  7 emgd,drm_kms_helper
agpgart                26747  1 drm
nf_conntrack_ipv4      13548  2
nf_defrag_ipv4          1101  1 nf_conntrack_ipv4
xt_connmark             1543  2
nf_conntrack           65114  2 xt_connmark,nf_conntrack_ipv4
iptable_mangle          1339  1
iptable_filter          1270  0
ip_tables              11330  2 iptable_filter,iptable_mangle
x_tables               14702  4 ip_tables,iptable_filter,xt_connmark,iptable_mangle
nfnetlink               3647  1
snd_hda_codec_realtek    58212  1
snd_hda_intel          30097  0
pch_can                10976  0
snd_hda_codec          92880  2 snd_hda_codec_realtek,snd_hda_intel
can_dev                 8085  1 pch_can
snd_pcm                71468  2 snd_hda_codec,snd_hda_intel
snd_page_alloc          7384  2 snd_pcm,snd_hda_intel
snd_timer              16602  1 snd_pcm
snd                    45144  5 snd_hda_codec_realtek,snd_timer,snd_pcm,snd_hda_codec,snd_hda_intel
pch_phub                8005  0
soundcore                842  1 snd
pch_gbe                50922  0
ptp_pch                 6620  1 pch_gbe
ptp                     7869  1 ptp_pch
pps_core                9432  1 ptp
minnowboard_keys        1370  0
minnowboard_gpio        1679  0
iwlwifi                71484  0
firmware_class         12759  1 iwlwifi
cfg80211              432319  1 iwlwifi


####### Recording using arecord ###################
root at minnow:~# arecord -d 5 test.wav -vvv
Recording WAVE 'test.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
Plug PCM: Rate conversion PCM (48000, sformat=U8)
Converter: linear-interpolation
Protocol version: 10002
Its setup is:
  stream       : CAPTURE
  access       : RW_INTERLEAVED
  format       : U8
  subformat    : STD
  channels     : 1
  rate         : 8000
  exact rate   : 8000 (8000/1)
  msbits       : 8
  buffer_size  : 2730
  period_size  : 682
  period_time  : 85312
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 682
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 2730
  silence_threshold: 0
  silence_size : 0
  boundary     : 357826560
Slave: Route conversion PCM (sformat=S16_LE)
  Transformation table:
    0 <- 0*0.5 + 1*0.5
Its setup is:
  stream       : CAPTURE
  access       : MMAP_INTERLEAVED
  format       : U8
  subformat    : STD
  channels     : 1
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 8
  buffer_size  : 16380
  period_size  : 4095
  period_time  : 85312
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 4095
  period_event : 0
  start_threshold  : 6
  stop_threshold   : 16380
  silence_threshold: 0
  silence_size : 0
  boundary     : 2146959360
Slave: Hardware PCM card 0 'HDA Intel MID' device 0 subdevice 0
Its setup is:
  stream       : CAPTURE
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 16380
  period_size  : 4095
  period_time  : 85312
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 4095
  period_event : 0
  start_threshold  : 6
  stop_threshold   : 16380
  silence_threshold: 0
  silence_size : 0
  boundary     : 2146959360
  appl_ptr     : 0
  hw_ptr       : 0
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%
 0%

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