Created attachment 116075 [details] Output of alsa-info.sh Cheap oriental MIDI adapter starts up with the following error, but works as expected.* E: [pulseaudio] module.c: Failed to load module "module-alsa-card" (argument: "device_id="1" name="usb-1a86_USB2.0-MIDI-00-USB20MIDI" card_name="alsa_card.usb-1a86_USB2.0-MIDI-00-USB20MIDI" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes card_properties="module-udev-detect.discovered=1""): initialization failed. The device: 1a86:752d QinHeng Electronics CH345 MIDI adapter Ubuntu 14.04.2 LTS Pulseaudio 1:4.0-0ubuntu11.1 * works almost as expected: there is one physical input and one output, but in ALSA one input and two outputs appear.
Created attachment 116077 [details] Output of pulseaudio -vvvv
module-udev-detect should skip card 1 when there is no pcm devices crw-rw----+ 1 root audio 116, 3 May 27 13:00 /dev/snd/controlC1 crw-rw----+ 1 root audio 116, 2 May 27 13:00 /dev/snd/midiC1D0
Updated the bug title. The error is harmless, as you found out.
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