[pulseaudio-tickets] [Bug 93163] New: Focusrite Scarlett forced to Multichannel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93163

            Bug ID: 93163
           Summary: Focusrite Scarlett forced to Multichannel
           Product: PulseAudio
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: daemon
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: vogelchr at vogel.cx
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Created attachment 120193
  --> https://bugs.freedesktop.org/attachment.cgi?id=120193&action=edit
Scarlett pactl and  lsusb-v output.

The Focusrite Scarlett 6i6 is a class-compliant multichannel audio interface
with 4 analog and 2 digital S/PDIF inputs and outputs each. When using the udev
detection pulseaudio only offers the multichannel profile, but I really want to
be able to switch to a Stereo Duplex mode.

(manual configuration of a alsa-source/sink in default.pa works, obviously)

Right now, I get high-pass filtered audio on the first 4 channels and the
subwoofer signal on the 6th channel, which of course is completely nonsensical.

Profiles:
 input:multichannel-input: Multichannel Input (...)
 output:multichannel-output: Multichannel Output (...)
 output:multichannel-output+input:multichannel-input: (...)
 <--- no more --->

How can I tweak udev-detect to force a particular mapping of channels?

{lsusb and pactl outputs added as compressed .txt file as it's over the 32k
limit}

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