[pulseaudio-tickets] [Bug 54673] master volume at zero and muted when pulseaudio starts

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54673

--- Comment #7 from Tanu Kaskinen <tanuk at iki.fi> 2012-09-10 14:48:35 UTC ---
(In reply to comment #6)
> (In reply to comment #5)
> > It seems the master channel on my "Intel 82801AA-ICH"/"SigmaTel STAC9700,83,84"
> > on alsamixer (it's actually a virtualised device on VirtualBox) has left and
> > right sub channels that can be adjusted with Q-Z and E-C respectively.
> 
> I couldn't tell you if you if this was a bug in alsa or not. Is there a
> "standard" way for driver writers/device manufactures to arrange mixer channels
> on a device?
> 
> If you need help reporting this to alsa let me know.

If by "this" you mean that the Master element has two channels, that's not a
bug at all. What may or may not be a bug is that the Master Mono element has
two channels too. But in any case, I don't think alsa needs to be fixed here
even if it's broken.

What I'd like you to do is to test the change in extra-hdmi.conf that I
suggested. If it fixes the problem, then I can write a patch, and hopefully
this problem won't bug people any more.

Changing the port to "LFE on seperate mono output" is only a workaround, not a
fix. The "LFE on seperate mono output" port is meant for cases where a laptop
has a separate subwoofer speaker that is handled in a bit strange way: there's
no separate subwoofer channel in the audio stream that pulseaudio writes to
alsa, but there's a separate volume element (Master Mono) for the subwoofer.

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