[pulseaudio-tickets] [Bug 94482] Incoming/recording sound volume much too soft/low when routed through USB audio

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94482

Alexander E. Patrakov <patrakov at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #28 from Alexander E. Patrakov <patrakov at gmail.com> ---
Assuming that all your USB sound cards are always connected to the PC, you can
work around the bug using module-remap-source. Here is how.

First, figure out the original source name by running "pactl list short
sources". It is in the second column. You need the row that corresponds to
module-alsa-card.c, has "usb" in its name, and does not have "monitor".
Hopefully there is only one such row for each of your USB soundcards.

Then, run this command once for each USB soundcard:

pacmd load-module module-remap-source master=... master_channel_map=front-left
channel_map=mono

with the original source name instead of "...".

Then, use pavucontrol to mark the new source as a fallback, and move all
programs' capture streams to it.

To make the change permanent, add this to the end of /etc/pulse/default.pa:

.nofail
load-module module-remap-source master=... master_channel_map=front-left
channel_map=mono
.fail

But of course, pulseaudio should provide hotplug-aware means to split a
multichannel USB soundcard into a set of mono sources. That's why this bug
should stay open even if the instructions above help.

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