[alsa-devel] wrong decibel data?

Colin Guthrie gmane at colin.guthr.ie
Sat Apr 3 12:09:33 CEST 2010

'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.



Colin Guthrie

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