[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 #17 from main.haarp at gmail.com ---
(In reply to Tanu Kaskinen from comment #15)
> (In reply to Tanu Kaskinen from comment #11)
> > (In reply to main.haarp from comment #9)
> > > (In reply to Tanu Kaskinen from comment #3)
> > > > 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?
Whoops, I meant software volume, of course. I determined it by changing the
volume after enabling ignore_dB. Seeing as I could change the volume of the
optical-out properly, it was clear that software volume was used.

(In reply to Raymond from comment #16)
> did your usb support ac3 passthrough using optical output since there is no
> iec958 controls and only one plaback device ?

I'm not sure. Never had the opportunity to test that.

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