2010/4/3 Colin Guthrie gmane@colin.guthr.ie
'Twas brillig, and Nicolo' Chieffo at 02/04/10 21:25 did gyre and gimble:
I just had a discussion with pulseaudio developers in which they told me that if the speakers don't emit any audio when the ALSA volume is 0%, then the correct gain value should be -inf dB (a value lower than -200 for pulseaudio means mute). Unfortunately my card has -48 dB.
They also said that if with -47.25 dB (which is what I get with ALSA volume set to 2%) I can hear audio even if it's very very low, at -48 dB I should still be able to hear something (the scale is logarithmic).
Their request is to change to -200 the gain reported from my card driver when the ALSA volume is set to 0%. Thanks
FWIW, I've got the same/similar h/w with a cutoff at 14% in PA as you have. I've been meaning to get this fixed for a while, but I'm incredibly lazy with certain things that don't bother me practically, so haven't followed it up yet.
Thanks for getting the ball rolling :)
If any specific debug is needed here, feel free to ask.
Col
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since PA provide software atten/software gain ,the software atten of 16bits audio is -48dB
I guess the problem is related to PA shift the 0dB point (i.e. the software gain +15dfB to 0dB)
you have to ask PA developer the value of software dB gain provided by the PA server