[alsa-devel] Invalid PCM pointer with CMI8738 and pcm.c buffer underuns

[andoru]

I've previously posted under ALSA's user mailing list so to avoid the
clutter, the details about what's happening is here:
http://article.gmane.org/gmane.linux.alsa.user/38258
http://article.gmane.org/gmane.linux.alsa.user/38260

There was no debug info under /proc/asound/card0/ so nothing to give from
there unless you guys need something specific.

Output of alsa-debug.sh:
http://www.alsa-project.org/db/?f=26187faadd47f3626029ba667cb004e74695f2b2

aplay returns:
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$ aplay -vv 03\ paris\ match-\ Bikeride.wav
Playing WAVE '03 paris match- Bikeride.wav' : Signed 16 bit Little Endian,
Rate 44100 Hz, Stereo
Plug PCM: Direct Stream Mixing PCM
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 44100
  exact rate   : 44100 (44100/1)
  msbits       : 16
  buffer_size  : 4096
  period_size  : 1024
  period_time  : 23219
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 1024
  period_event : 0
  start_threshold  : 4096
  stop_threshold   : 4096
  silence_threshold: 0
  silence_size : 0
  boundary     : 1073741824
Hardware PCM card 0 'C-Media CMI8738' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 44100
  exact rate   : 44100 (44100/1)
  msbits       : 16
  buffer_size  : 4096
  period_size  : 1024
  period_time  : 23219
  tstamp_mode  : ENABLE
  period_step  : 1
  avail_min    : 1024
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 1073741824
  silence_threshold: 0
  silence_size : 1073741824
  boundary     : 1073741824
  appl_ptr     : 0
  hw_ptr       : 0
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