The calculation of the dB value depends on whether you are working with
amplitude values or power values. For power values, the formula is
10·log10(x), with x the relative power. For amplitude values, the
formula is 20·log10(x).
for DAC
log10(0.006) = -2.2218
refer to 5. FUNCTION BLOCK DIAGRAM OF CM106-F+/L+
step 0 ~ 37
volume is 0 ~ -45dB
8.2 ADC VOLUME CONTROL
step 0 ~ 15
0 ~ 22.5 dB
8.3 MIC / LINE-IN MONITOR VOLUME CONTROL
step 0 ~ 31
-33 ~ 12 dB
USB Mixer: usb_id=0x0d8c0006, ctrlif=0, ctlerr=0
Card: USB Audio at usb-0000:00:1d.1-1, full speed
Unit: 2
Control: name="PCM Capture Volume", index=0
Info: id=2, control=2, cmask=0x3, channels=2, type="S16"
Volume: min=0, max=4095, dBmin=0, dBmax=1599
Unit: 7
Control: name="PCM Capture Source", index=0
Info: id=7, control=0, cmask=0x0, channels=1, type="U8"
Volume: min=1, max=4, dBmin=0, dBmax=0
Unit: 8
Control: name="Auto Gain Control", index=0
Info: id=8, control=7, cmask=0x0, channels=1, type="BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
Unit: 8
Control: name="Mic Capture Volume", index=0
Info: id=8, control=2, cmask=0x3, channels=2, type="S16"
Volume: min=0, max=4095, dBmin=0, dBmax=1599
Unit: 9
Control: name="Mic Playback Volume", index=0
Info: id=9, control=2, cmask=0x3, channels=2, type="S16"
Volume: min=0, max=8191, dBmin=0, dBmax=3199
Unit: 9
Control: name="Mic Playback Switch", index=0
Info: id=9, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
Unit: 11
Control: name="Line Playback Volume", index=0
Info: id=11, control=2, cmask=0x3, channels=2, type="S16"
Volume: min=0, max=8191, dBmin=0, dBmax=3199
Unit: 11
Control: name="Line Playback Switch", index=0
Info: id=11, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
Unit: 13
Control: name="Speaker Playback Volume", index=0
Info: id=13, control=2, cmask=0x0, channels=1, type="S16"
Volume: min=0, max=37, dBmin=0, dBmax=14
Unit: 13
Control: name="Speaker Playback Switch", index=0
Info: id=13, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
Unit: 15
Control: name="Line Capture Volume", index=0
Info: id=15, control=2, cmask=0x3, channels=2, type="S16"
Volume: min=0, max=4095, dBmin=0, dBmax=1599
Unit: 16
Control: name="IEC958 In Capture Switch", index=0
Info: id=16, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
Volume: min=0, max=1, dBmin=0, dBmax=0
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https://bugs.launchpad.net/bugs/1200925
Title:
[USB-Audio - USB Audio, playback] Playback problem Playback only at
maximum level, if the volume is turned down just a little no sound is
played.
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