[pulseaudio-tickets] [Bug 81777] Can't change optical-out volume on Terratec Aureon DualUSB

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81777

--- Comment #15 from Tanu Kaskinen <tanuk at iki.fi> ---
(In reply to Tanu Kaskinen from comment #11)
> (In reply to main.haarp from comment #9)
> > (In reply to Tanu Kaskinen from comment #3)
> > > (In reply to comment #2)
> > > > Interestingly, if I set ignore_dB=1 then PA falls back to software-mixing
> > > > only. That actually seems like a simpler workaround ten yours, Tanu :P
> > > 
> > > That shouldn't happen... ignore_dB=1 should have the opposite effect:
> > > software volume should get disabled for the device.
> > I swear that it reverts to exclusive software-mixing. Maybe it's because PA
> > on this machine is quite old? (Debian stable has PA 2.0)
> 
> It sounds unlikely that the behaviour would have changed that way. I'll have
> to test this myself when I get time.

I now tested ignore_dB with the Aureon card, and it behaved as I expected
(hardware volume is still used). What exactly do you mean by "software-mixing"?
My assumption is that you mean software volume, not mixing multiple streams
(mixing multiple streams is always done in software, since PulseAudio doesn't
support hardware mixing). How do you determine whether "software-mixing" or
software volume is being used?

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