ALSA error on finding "working profile" for a USB MIDI device.

[GitHub issues - edited]

alsa-project/alsa-lib issue #89 was edited from radiobla:

TL;DR: After upgrading alsa-* packages yesterday, on the next reboot, systemd (apparently, pulseaudio.service) begun to show an error message related to "module-alsa-card" not finding a "working profile" for a USB MIDI device I have connected. Despite the error message, the device is working fine (through "raw MIDI" and also with jack2). Anyway, I want go further and find the root cause of this problem, since it's very annoying to see the Sound Service failing on every reboot.

Here is my pacman.log from yesterday:

**[ALPM] upgraded alsa-topology-conf (1.2.3-1 -> 1.2.4-1)
[ALPM] upgraded alsa-ucm-conf (1.2.3-2 -> 1.2.4-1)
[ALPM] upgraded alsa-lib (1.2.3.2-1 -> 1.2.4-1)
[ALPM] upgraded alsa-utils (1.2.3-2 -> 1.2.4-1)
[ALPM] upgraded lib32-alsa-lib (1.2.3.2-1 -> 1.2.4-1)**

After a reboot, the Sound Service could start, but begun to show an error message.

Taking a look on the systemd logs with

journalctl -xe --user-unit pulseaudio

I found this:

systemd[1027]: Starting Sound Service...
...
**pulseaudio[1037]: Failed to find a working profile.
pulseaudio[1037]: Failed to load module "module-alsa-card" (argument: "device_id="3" name="usb-Roland_A->
pulseaudio[1037]: module-rescue-stream is obsolete and should no longer be loaded. Please remove it from>
systemd[1027]: Started Sound Service.**

I disabled the "load-module module-rescue-streams" on the default.pa, but the other issue persists. They seem not be related, IMO. I wanted to rule out that chance anyway.

By stopping pulseaudio service through systemd and running

pulseaudio -vvv

manually, I got more verbose information.

**E: [pulseaudio] module-alsa-card.c: Failed to find a working profile.
E: [pulseaudio] module.c: Failed to load module "module-alsa-card" (argument: "device_id="1" name="usb-Roland_A-Series_Keyboard-00" card_name="alsa_card.usb-Roland_A-Series_Keyboard-00" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.  
I: [pulseaudio] module-udev-detect.c: Card /devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/sound/card1 (alsa_card.usb-Roland_A-Series_Keyboard-00) failed to load module.**

Regarding specifically to the following error message...

**E: [pulseaudio] module-alsa-card.c: Failed to find a working profile.**

What does it mean it is not finding a "working profile"? How could I investigate it further?

It worth mentioning that the device (an USB Keyboard Controller) is working
perfectly with jack2. I tested it with an "aseqdump".

$ aseqdump -l
 Port    Client name                      Port name
  0:0    System                           Timer
  0:1    System                           Announce
 14:0    Midi Through                     Midi Through Port-0
 20:0    A-Series Keyboard                A-Series Keyboard Keyboard

$ aseqdump -p20:0
Waiting for data. Press Ctrl+C to end.
Source  Event                  Ch  Data
 20:0   Note on                 0, note 41, velocity 76
 20:0   Note on                 0, note 40, velocity 82

Although the device is working even with the error message, it's very annoying to see a "failed service" on initialization.

Thanks!

More occurrences of this error were provided on Arch Linux [forum](https://bbs.archlinux.org/viewtopic.php?pid=1932801)

Issue URL     : https://github.com/alsa-project/alsa-lib/issues/89
Repository URL: https://github.com/alsa-project/alsa-lib