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 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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