Fiio M3K: Failed to find a working profile

[x1unix]

Hello, I have a Fiio M3K player which I often use as an external USB DAC.

It worked well with Pipewire, but I had some other issues with Pipewire so I had to rollback to PulseAudio. Unfortunately, PulseAudio and module-alsa-card cannot setup this device, so it doesn't work.

Here is a small portion of PulseAudio log (full log is available at link below):

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="2" name="usb-GuangZhou_FiiO_Electronics_Technology_Co.__Ltd._FiiO_M3K_FiiO_M3K-00" card_name="alsa_card.usb-GuangZhou_FiiO_Electronics_Technology_Co.__Ltd._FiiO_M3K_FiiO_M3K-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/pci0000:00/0000:00:08.1/0000:0b:00.3/usb5/5-1/5-1:1.0/sound/card2 (alsa_card.usb-GuangZhou_FiiO_Electronics_Technology_Co.__Ltd._FiiO_M3K_FiiO_M3K-00) failed to load module.
D: [pulseaudio] module-udev-detect.c: /dev/snd/controlC2 is accessible: yes
D: [pulseaudio] module-udev-detect.c: /devices/pci0000:00/0000:00:08.1/0000:0b:00.3/usb5/5-1/5-1:1.0/sound/card2 is busy: no

I'm using ArchLinux with Linux 5.11.2 and PulseAudio 14.2.

Logs and debug info

USB device in lsusb output:

Bus 005 Device 022: ID 2972:0044 FiiO Electronics Technology FiiO M3K

aplay, pulseaudio debug log and other info I've posted as gist: https://gist.github.com/x1unix/dae3fb810ac499cc63362a805220968f

[perexg]

D: [pulseaudio] alsa-util.c: Managed to open front:2
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 16 bit Little Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 16 bit Big Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Float 32 bit Little Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Float 32 bit Big Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 32 bit Little Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 32 bit Big Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 24 bit Little Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 24 bit Big Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: Maximum hw buffer size is 3962 ms
D: [pulseaudio] alsa-util.c: Set neither period nor buffer size.
I: [pulseaudio] alsa-util.c: snd_pcm_hw_params failed: No such device or address
D: [pulseaudio] alsa-util.c: Trying front:2 without SND_PCM_NO_AUTO_FORMAT ...
D: [pulseaudio] alsa-util.c: Managed to open front:2
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 16 bit Little Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 16 bit Big Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Float 32 bit Little Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Float 32 bit Big Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 32 bit Little Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 32 bit Big Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 24 bit Little Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_format(Signed 24 bit Big Endian) failed: Invalid argument
D: [pulseaudio] alsa-util.c: Maximum hw buffer size is 3962 ms
D: [pulseaudio] alsa-util.c: Set neither period nor buffer size.

No idea. It may be a kernel driver problem. There were some issues recently.

[x1unix]

@perexg found some interesting effect. Device is detected and configured successfully if it's connected during boot time.

Tested on a recent Arch kernel 5.12.3

[perexg]

Then it appears like a device initialization issue. It's not easy to find the culprit then (udev / pulseaudio handshake).