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Ubuntu 18.04.3 LTS and the Roland Quad Capture USB Sound Device

Posted: Mon Aug 12, 2019 10:02 am
by mediatechnology
I just installed Ubuntu 18.04 LTS alongside my Win XP test and measurement machine.

There was only one minor issue: The Roland "Quad Capture" (2 In 2 Out Analog) is mistakenly profiled as an Analog 4.0 Output.

With the 18.04 "Live" demo DVD (which is Lubuntu) the Quad Capture worked perfectly.
It was only after the actual 18.04 distribution was installed did audio fail.
I know this is not a hardware/USB problem...

Being USB and only 2 channel Analog Out the Quad Capture does not support audio transfer when it is configured for 4 channel output.

This is either a Pulse or Alsa problem and it is common to Ubuntu 16.04 which I checked on another machine.

Code: Select all

Card #1
	Name: alsa_card.usb-Roland_QUAD-CAPTURE_0000F569D4A7519F5A348C2B2B0622C0-00
	Driver: module-alsa-card.c
	Owner Module: 22
		alsa.card = "1"
		alsa.card_name = "QUAD-CAPTURE"
		alsa.long_card_name = "Roland QUAD-CAPTURE at usb-0000:00:02.1-4, high speed"
		alsa.driver_name = "snd_usb_audio"
		device.bus_path = "pci-0000:00:02.1-usb-0:4:1.0"
		sysfs.path = "/devices/pci0000:00/0000:00:02.1/usb1/1-4/1-4:1.0/sound/card1" = "usb-Roland_QUAD-CAPTURE_0000F569D4A7519F5A348C2B2B0622C0-00"
		device.bus = "usb" = "0582" = "Roland Corp." = "012f" = "QUAD-CAPTURE"
		device.serial = "Roland_QUAD-CAPTURE_0000F569D4A7519F5A348C2B2B0622C0"
		device.string = "1"
		device.description = "QUAD-CAPTURE"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card-usb"
		input:multichannel-input: Multichannel Input (sinks: 0, sources: 1, priority: 1, available: yes)
		output:multichannel-output: Multichannel Output (sinks: 1, sources: 0, priority: 100, available: yes)
		off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
	Active Profile: output:multichannel-output
		multichannel-input: Multichannel Input (priority: 0, latency offset: 0 usec)
			Part of profile(s): input:multichannel-input
		multichannel-output: Multichannel Output (priority: 0, latency offset: 0 usec)
			Part of profile(s): output:multichannel-output
The question I have is where do I fix this persistently?
What file and where?