[pulseaudio-tickets] [Bug 100555] Digital and analog port for the same card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100555

--- Comment #4 from Tanu Kaskinen <tanuk at iki.fi> ---
The G930 headset seems to have "Dolby 7.1 Surround Sound" as one of the
features[1]. If that's supported on Linux at all, I suppose it might be
implemented via an iec958 device using passthrough. If that's the case, it's
probably not an alsa bug.

Do you get audio from the headset no matter which output you select?

If someone wants to work on merging the two ports (I probably won't have time
for it), ideally alsa would somehow indicate that on this device the analog and
digital outputs actually go to the same place. If that's not going to happen, I
think it would be possible to write custom profile configuration for this
device in pulseaudio and ask for its inclusion in upstream (there are several
other special configurations for particular sound cards too). The configuration
could define two output mappings, and one output port that is used by both
mappings.

Some documentation about the profile configuration:
https://www.freedesktop.org/wiki/Software/PulseAudio/Backends/ALSA/Profiles/

As for the internal sound card, merging the ports doesn't make sense. If there
are both analog and digital outputs on the sound card, they should have
separate ports. If there's no digital output, having the iec958 device
available is an alsa bug.

[1]
https://www.amazon.com/Logitech-Wireless-Surround-Headphones-Microphone/dp/B003VANOFY

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