Bad decibel using Creative X-Fi XtremeGamer Pci

[Kaan KASIM <kaankasim88@xxxxxxxxx>]

Noticeable when using Pulseaudio with 5.1 channel. Center volume is almost inaudible even though alsamixer shows every channel is maxed out. The test log shows that the decibels are wrong.

dbverify output: http://pastie.org/2882755

./dbverify XFi Master 30 200
Opening plughw:XFi for PCM.
Plug PCM: Hardware PCM card 0 'Creative X-Fi' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : FLOAT_LE
  subformat    : STD
  channels     : 1
  rate         : 44100
  exact rate   : 44100 (44100/1)
  msbits       : 32
  buffer_size  : 32768
  period_size  : 256
  period_time  : 5804
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 256
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 32768
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 0
Opening hw:XFi for control.
Using element 'Master'.
Element volume range is 0..256 (-99999.99..0.00 dB).
Testing volume steps 30 vs. 200.
Testing dB steps -56.50 vs. -14.00.
Attenuation factor is 0.0075 (-42.50 dB).
Playing 1s of audio at amplitude 0.7500, mixer set to 30 (-56.50 dB).
Mixer set, sleeping 0.5s
Sleeping 0.5s...
Playing 1s of audio at amplitude 0.0056, mixer set to 200 (-14.00 dB).
Mixer set, sleeping 0.5s

./dbverify XFi PCM 30 200
Opening plughw:XFi for PCM.
Plug PCM: Hardware PCM card 0 'Creative X-Fi' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : FLOAT_LE
  subformat    : STD
  channels     : 1
  rate         : 44100
  exact rate   : 44100 (44100/1)
  msbits       : 32
  buffer_size  : 32768
  period_size  : 256
  period_time  : 5804
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 256
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 32768
  silence_threshold: 0
  silence_size : 0
  boundary     : 4611686018427387904
  appl_ptr     : 0
  hw_ptr       : 0
Opening hw:XFi for control.
Using element 'PCM'.
Element volume range is 0..256 (-99999.99..0.00 dB).
Testing volume steps 30 vs. 200.
Testing dB steps -56.50 vs. -14.00.
Attenuation factor is 0.0075 (-42.50 dB).
Playing 1s of audio at amplitude 0.7500, mixer set to 30 (-56.50 dB).
Mixer set, sleeping 0.5s
Sleeping 0.5s...
Playing 1s of audio at amplitude 0.0056, mixer set to 200 (-14.00 dB).
Mixer set, sleeping 0.5s

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