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balena-io-experimental / audio

Audio building block for balenaOS, based on pulseaudio.
https://hub.balena.io/blocks
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PulseAudio doesn't detect USB hot-plugging if no USB device was connected at startup #85

Open tmigone opened 2 years ago

tmigone commented 2 years ago

To replicate

  1. Start audio block
  2. Connect a USB sound card to your device

Running udev monitor or aplay -l will show that both udev and ALSA are picking up the sound card. However running pactl list sinks will yield no result. PulseAudio is ignoring the udev events it seems.

If you invert the order of operations however hotplugging works as intended:

  1. Connect a USB sound card to your device
  2. Start audio block

This might be related to how systemd ALSA rules are handled, and how PulseAudio interacts with that (seems a bit sketchy?). Some references here for further investigation:

jellyfish-bot commented 2 years ago

[tmigone] This issue has attached support thread https://jel.ly.fish/23fd0d70-7d8e-446e-a4d5-891f1f705c80

i-garrison commented 1 year ago

I'd guess this could be kernel or alsa-lib issue so please re-test. The error reported looks almost like if kernel alsa layer created /dev/snd/ entry (which is getting picked by pulseaudio udev monitoring routine) before kernel alsa driver completed all things required for alsa-lib to actually use the device successfully - this should never happen.

bbugh commented 8 months ago

I know this has been ages, but was any progress made on this? That jellyfish URL seems to be invalid.

We're having issues with a container starting up and even when the USB device is plugged in, it doesn't always recognize it in time. Even when it does, no hot swapping seems to work. When this occurs, after boot, there's no sound card discovered and no way to fix it without restarting the service, which starts the process over and may still not fix it.

smiccoli commented 1 week ago

although we first found about this issue when testing DACs, I also have a similar problem with the audio jack. I could replicate this with a minimal balena-sound instance in standalone and with spotify. We are using the .

What I realized is that on a different model of hardware, flashed with the same balena OS image (generic x64 GPT version), the alsa_output.hda-intel.analog-stereo sink is always visible, regardless of the jack being connected or not and the hot plugging works smoothly. However, on the hardware showing the issue, the sink appears and disappears following the plugged cable, but if the cable was not plugged at startup, the sink would stain in IDLE state (with a different ID, which probably explains the issue)

List sinks after boot with cable connected

bash-5.1# pactl list sinks
Sink #0
        State: RUNNING
        Name: alsa_output.hda-intel.analog-stereo
        Description: Built-in Audio Analog Stereo
        Driver: module-alsa-card.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 6
        Mute: no
        Volume: front-left: 49152 /  75% / -7.50 dB,   front-right: 49152 /  75% / -7.50 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: alsa_output.hda-intel.analog-stereo.monitor
        Latency: 46484 usec, configured 66666 usec
        Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY 
        Properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "ALC269VB Analog"
                alsa.id = "ALC269VB Analog"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "0"
                alsa.card_name = "HDA Intel PCH"
                alsa.long_card_name = "HDA Intel PCH at 0x91210000 irq 133"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:0e.0"
                sysfs.path = "/devices/pci0000:00/0000:00:0e.0/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.product.id = "5a98"
                device.form_factor = "internal"
                device.string = "front:0"
                device.buffering.buffer_size = "352800"
                device.buffering.fragment_size = "176400"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analog Stereo"
                device.description = "Built-in Audio Analog Stereo"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        Ports:
                analog-output-speaker: Speakers (type: Speaker, priority: 10000, available)
        Active Port: analog-output-speaker
        Formats:
                pcm

Sink #1
        State: IDLE
        Name: balena-sound.input
        Description: Null Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 21
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: balena-sound.input.monitor
        Latency: 29566 usec, configured 66666 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Null Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm

Sink #2
        State: RUNNING
        Name: balena-sound.output
        Description: Null Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 22
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: balena-sound.output.monitor
        Latency: 44743 usec, configured 66666 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Null Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm

Sink #3
        State: SUSPENDED
        Name: snapcast
        Description: Null Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 23
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: snapcast.monitor
        Latency: 0 usec, configured 0 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Null Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm

List sinks after unplugging the cable

bash-5.1# pactl list sinks
Sink #1
        State: RUNNING
        Name: balena-sound.input
        Description: Null Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 21
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: balena-sound.input.monitor
        Latency: 49041 usec, configured 66666 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Null Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm

Sink #2
        State: RUNNING
        Name: balena-sound.output
        Description: Null Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 22
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: balena-sound.output.monitor
        Latency: 63825 usec, configured 66666 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Null Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm

Sink #3
        State: SUSPENDED
        Name: snapcast
        Description: Null Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 23
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: snapcast.monitor
        Latency: 0 usec, configured 0 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Null Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm

List sinks after plugging again the cable

bash-5.1# pactl list sinks
Sink #1
        State: RUNNING
        Name: balena-sound.input
        Description: Null Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 21
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: balena-sound.input.monitor
        Latency: 25150 usec, configured 66666 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Null Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm

Sink #2
        State: RUNNING
        Name: balena-sound.output
        Description: Null Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 22
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: balena-sound.output.monitor
        Latency: 65971 usec, configured 66666 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Null Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm

Sink #3
        State: SUSPENDED
        Name: snapcast
        Description: Null Output
        Driver: module-null-sink.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 23
        Mute: no
        Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: snapcast.monitor
        Latency: 0 usec, configured 0 usec
        Flags: DECIBEL_VOLUME LATENCY SET_FORMATS 
        Properties:
                device.description = "Null Output"
                device.class = "abstract"
                device.icon_name = "audio-card"
        Formats:
                pcm

Sink #4
        State: IDLE
        Name: alsa_output.hda-intel.analog-stereo
        Description: Built-in Audio Analog Stereo
        Driver: module-alsa-card.c
        Sample Specification: s16le 2ch 44100Hz
        Channel Map: front-left,front-right
        Owner Module: 6
        Mute: no
        Volume: front-left: 49152 /  75% / -7.50 dB,   front-right: 49152 /  75% / -7.50 dB
                balance 0.00
        Base Volume: 65536 / 100% / 0.00 dB
        Monitor Source: alsa_output.hda-intel.analog-stereo.monitor
        Latency: 67121 usec, configured 66666 usec
        Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY 
        Properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "ALC269VB Analog"
                alsa.id = "ALC269VB Analog"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "0"
                alsa.card_name = "HDA Intel PCH"
                alsa.long_card_name = "HDA Intel PCH at 0x91210000 irq 133"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:0e.0"
                sysfs.path = "/devices/pci0000:00/0000:00:0e.0/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.product.id = "5a98"
                device.form_factor = "internal"
                device.string = "front:0"
                device.buffering.buffer_size = "352800"
                device.buffering.fragment_size = "176400"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analog Stereo"
                device.description = "Built-in Audio Analog Stereo"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        Ports:
                analog-output-speaker: Speakers (type: Speaker, priority: 10000, available)
        Active Port: analog-output-speaker
        Formats:
                pcm
wilhelmmueller commented 2 days ago

We're currently working around this issue by using pactl to manually load the module-alsa-card for the device when it is connected and unload it upon disconnection. This loading and unloading process is triggered by udev.

Additionally, the 78-sound-card.rules file provides guidance on which events to filter in udev, so I recommend checking its comments for further insights.