[alsa-devel] wrong decibel data?

Raymond Yau superquad.vortex2 at gmail.com
Mon Jun 14 10:38:00 CEST 2010

2010/6/14 Colin Guthrie <gmane at colin.guthr.ie>

> 'Twas brillig, and Raymond Yau at 14/06/10 01:25 did gyre and gimble:
> > if your sound card have ac97 codec ., you can use audacity to record the
> > output from hw:0,0 and you will see clipping occur when you set "PCM"
> volume
> > above 0dB
> So the standard response is "don't do that then" :)
> That's why the base volume is shown to the user via GUIs so that they
> can gauge the best point on the slider to use. Currently there is no
> indication with alsa sliders at which point the 0dB "sweet spot" lies.
> IMO this is a good improvement for usability.
> Col
This is bug in pulseaudio in dB calculation because it shift the ALSA 's dB
value to PA 's own dB value

I guess none of PA developers has AC97 sound card

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