Pulseaudio cannot detect PCM device

[dmitrypozhidaev]

I have IMX6Q based board and want game with pulseaudio.

My board have 3 sound devices.

    # aplay -l

    **** List of PLAYBACK Hardware Devices ****

    card 0: tlv320aic3xaudi [tlv320aic3x-audio], device 0: HiFi tlv320aic3x-hifi-0 []

      Subdevices: 1/1

      Subdevice #0: subdevice #0

    card 1: tlv320aic32x4au [tlv320aic32x4-audio], device 0: HiFi tlv320aic32x4-hifi-0 []

      Subdevices: 1/1

      Subdevice #0: subdevice #0

    card 2: imxhdmisoc [imx-hdmi-soc], device 0: i.MX HDMI Audio Tx hdmi-hifi-0 []

      Subdevices: 1/1

      Subdevice #0: subdevice #0

So device is **hw:1,0**

    aplay -D plughw:1,0 /usr/share/sounds/2.wav

This worked fine.

But at start the Pulseaudio do not detect PCM devices.

I try manually configure PA via

    # pactl load-module module-alsa-sink device="hw:1,0"

got answer:

    Failure: Module initialization failed

and manually started (# pulseaudio --system -vvvv --log-meta) pulseaudio make log:

    I: [pulseaudio][pulsecore/client.c:80 pa_client_new()] Created 1 "Native client (UNIX socket client)"

    I: [pulseaudio][pulsecore/protocol-native.c:5012 pa_native_protocol_connect()] Client authenticated anonymously.

    D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Client added for object /org/pulseaudio/core1/client1

    D: [pulseaudio][pulsecore/protocol-native.c:2601 command_auth()] Protocol version: remote 29, local 29

    D: [pulseaudio][pulsecore/protocol-native.c:2664 command_auth()] SHM possible: no

    D: [pulseaudio][pulsecore/protocol-native.c:2682 command_auth()] Negotiated SHM: no

    D: [pulseaudio][modules/alsa/alsa-util.c:673 pa_alsa_open_by_device_string()] Trying hw:1,0 with SND_PCM_NO_AUTO_FORMAT ...

    I: [pulseaudio][(alsa-lib)pcm_hw.c:1667 _snd_pcm_hw_open()] Invalid value for card

    **I: [pulseaudio][modules/alsa/alsa-util.c:680 pa_alsa_open_by_device_string()] Error opening PCM device hw:1,0: No such file or directory

    E: [pulseaudio][pulsecore/module.c:175 pa_module_load()] Failed to load module "module-alsa-sink" (argument: "device=hw:1,0"): initialization failed.**

    I: [pulseaudio][pulsecore/client.c:102 pa_client_free()] Freed 1 "pactl"

    I: [pulseaudio][pulsecore/protocol-native.c:4903 pstream_die_callback()] Connection died.

    D: [pulseaudio][pulsecore/protocol-dbus.c:835 pa_dbus_protocol_remove_interface()] Interface org.PulseAudio.Core1.Client removed from object /org/pulseaudio/core1/client1

why PA cannot open device?

P.S. start PA log

# killall pulseaudio

# pulseaudio --system -vvvv --log-meta

W: [pulseaudio][daemon/main.c:726 main()] Running in system mode, but --disallow-exit not set!

W: [pulseaudio][daemon/main.c:729 main()] Running in system mode, but --disallow-module-loading not set!

N: [pulseaudio][daemon/main.c:732 main()] Running in system mode, forcibly disabling SHM mode!

N: [pulseaudio][daemon/main.c:737 main()] Running in system mode, forcibly disabling exit idle time!

D: [pulseaudio][pulsecore/core-rtclock.c:166 pa_rtclock_hrtimer_enable()] Timer slack is set to 50 us.

D: [pulseaudio][pulsecore/core-util.c:871 set_nice()] setpriority() worked.

I: [pulseaudio][pulsecore/core-util.c:914 pa_raise_priority()] Successfully gained nice level -11.

I: [pulseaudio][daemon/main.c:195 change_user()] Found user 'pulse' (UID 1000) and group 'pulse' (GID 1000).

W: [pulseaudio][daemon/caps.c:98 pa_drop_caps()] Normally all extra capabilities would be dropped now, but that's impossible because PulseAudio was built without capabilities support.

I: [pulseaudio][daemon/main.c:271 change_user()] Successfully changed user to "pulse".

I: [pulseaudio][daemon/main.c:916 main()] This is PulseAudio 5.0

D: [pulseaudio][daemon/main.c:917 main()] Compilation host: arm-buildroot-linux-gnueabihf

D: [pulseaudio][daemon/main.c:918 main()] Compilation CFLAGS: -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -O2  -Wall -W -Wextra -Wno-long-long -Wno-overlength-strings -Wunsafe-loop-optimizations -Wundef -Wformat=2 -Wlogical-op -Wsign-compare -Wformat-security -Wmissing-include-dirs -Wformat-nonliteral -Wpointer-arith -Winit-self -Wdeclaration-after-statement -Wfloat-equal -Wmissing-prototypes -Wredundant-decls -Wmissing-declarations -Wmissing-noreturn -Wshadow -Wendif-labels -Wcast-align -Wstrict-aliasing -Wwrite-strings -Wno-unused-parameter -ffast-math -fno-common -fdiagnostics-show-option

D: [pulseaudio][daemon/main.c:921 main()] Running on host: Linux armv7l 3.10.23-svn72 #3 SMP Tue Oct 14 15:10:49 MSK 2014

D: [pulseaudio][daemon/main.c:924 main()] Found 4 CPUs.

I: [pulseaudio][daemon/main.c:926 main()] Page size is 4096 bytes

D: [pulseaudio][daemon/main.c:931 main()] Compiled with Valgrind support: no

D: [pulseaudio][daemon/main.c:934 main()] Running in valgrind mode: no

D: [pulseaudio][daemon/main.c:936 main()] Running in VM: no

D: [pulseaudio][daemon/main.c:939 main()] Optimized build: yes

D: [pulseaudio][daemon/main.c:947 main()] FASTPATH defined, only fast path asserts disabled.

I: [pulseaudio][daemon/main.c:956 main()] Machine ID is 8156dcb6930fc1dca0f83dd10000000d.

I: [pulseaudio][daemon/main.c:966 main()] Using runtime directory /var/run/pulse.

I: [pulseaudio][daemon/main.c:971 main()] Using state directory /var/lib/pulse.

I: [pulseaudio][daemon/main.c:974 main()] Using modules directory /usr/lib/pulse-5.0/modules.

I: [pulseaudio][daemon/main.c:976 main()] Running in system mode: yes

W: [pulseaudio][daemon/main.c:981 main()] OK, so you are running PA in system mode. Please note that you most likely shouldn't be doing that.

W: [pulseaudio][daemon/main.c:981 main()] If you do it nonetheless then it's your own fault if things don't work as expected.

W: [pulseaudio][daemon/main.c:981 main()] Please read http://pulseaudio.org/wiki/WhatIsWrongWithSystemMode for an explanation why system mode is usually a bad idea.

I: [pulseaudio][daemon/main.c:1006 main()] Fresh high-resolution timers available! Bon appetit!

D: [pulseaudio][pulsecore/memblock.c:744 pa_mempool_new()] Using private memory pool with 1024 slots of size 64.0 KiB each, total size is 64.0 MiB, maximum usable slot size is 65496

W: [pulseaudio][pulsecore/random.c:125 pa_random()] Failed to get proper entropy. Falling back to unsecure pseudo RNG.

I: [pulseaudio][pulsecore/cpu-arm.c:133 pa_cpu_get_arm_flags()] CPU flags: V6 V7 VFP EDSP NEON VFPV3

I: [pulseaudio][pulsecore/svolume_arm.c:162 pa_volume_func_init_arm()] Initialising ARM optimized volume functions.

I: [pulseaudio][pulsecore/sconv_neon.c:91 pa_convert_func_init_neon()] Initialising ARM NEON optimized conversions.

I: [pulseaudio][pulsecore/mix_neon.c:90 pa_mix_func_init_neon()] Initialising ARM NEON optimized mixing functions.

D: [pulseaudio][pulsecore/module.c:77 pa_module_exists()] Checking for existence of '/usr/lib/pulse-5.0/modules/module-udev-detect.so': success

D: [pulseaudio][modules/module-udev-detect.c:296 verify_access()] /dev/snd/controlC2 is accessible: no

D: [pulseaudio][modules/module-udev-detect.c:296 verify_access()] /dev/snd/controlC0 is accessible: no

D: [pulseaudio][modules/module-udev-detect.c:296 verify_access()] /dev/snd/controlC1 is accessible: no

I: [pulseaudio][modules/module-udev-detect.c:801 module_udev_detect_LTX_pa__init()] Found 3 cards.

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-udev-detect" (index: #0; argument: "").

D: [pulseaudio][pulsecore/module.c:77 pa_module_exists()] Checking for existence of '/usr/lib/pulse-5.0/modules/module-esound-protocol-unix.so': success

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-esound-protocol-unix" (index: #1; argument: "").

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-native-protocol-unix" (index: #2; argument: "auth-anonymous=1").

I: [pulseaudio][modules/module-stream-restore.c:2446 module_stream_restore_LTX_pa__init()] Successfully opened database file '/var/lib/pulse/8156dcb6930fc1dca0f83dd10000000d-stream-volumes'.

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Ext.StreamRestore1 added for object /org/pulseaudio/stream_restore1

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-stream-restore" (index: #3; argument: "").

I: [pulseaudio][modules/module-device-restore.c:1272 module_device_restore_LTX_pa__init()] Successfully opened database file '/var/lib/pulse/8156dcb6930fc1dca0f83dd10000000d-device-volumes'.

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-device-restore" (index: #4; argument: "").

I: [pulseaudio][modules/module-default-device-restore.c:77 load()] Saved default sink 'auto_null' not existent, not restoring default sink setting.

I: [pulseaudio][modules/module-default-device-restore.c:98 load()] Saved default source 'auto_null.monitor' not existent, not restoring default source setting.

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-default-device-restore" (index: #5; argument: "").

D: [pulseaudio][pulsecore/module.c:77 pa_module_exists()] Checking for existence of '/usr/lib/pulse-5.0/modules/module-dbus-protocol.so': success

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Memstats added for object /org/pulseaudio/core1/memstats

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module0

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module1

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module2

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module3

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module4

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module5

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module6

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1 added for object /org/pulseaudio/core1

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-dbus-protocol" (index: #6; argument: "access=local").

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-rescue-streams" (index: #7; argument: "").

D: [pulseaudio][modules/module-always-sink.c:77 load_null_sink_if_needed()] Autoloading null-sink as no other sinks detected.

I: [pulseaudio][pulsecore/sink.c:371 pa_sink_new()] Created sink 0 "auto_null" with sample spec s16le 2ch 44100Hz and channel map front-left,front-right

I: [pulseaudio][pulsecore/sink.c:371 pa_sink_new()]     device.description = "Dummy Output"

I: [pulseaudio][pulsecore/sink.c:371 pa_sink_new()]     device.class = "abstract"

I: [pulseaudio][pulsecore/sink.c:371 pa_sink_new()]     device.icon_name = "audio-card"

D: [pulseaudio][pulsecore/core-subscribe.c:244 pa_subscription_post()] Dropped redundant event due to change event.

I: [pulseaudio][pulsecore/source.c:357 pa_source_new()] Created source 0 "auto_null.monitor" with sample spec s16le 2ch 44100Hz and channel map front-left,front-right

I: [pulseaudio][pulsecore/source.c:357 pa_source_new()]     device.description = "Monitor of Dummy Output"

I: [pulseaudio][pulsecore/source.c:357 pa_source_new()]     device.class = "monitor"

I: [pulseaudio][pulsecore/source.c:357 pa_source_new()]     device.icon_name = "audio-input-microphone"

D: [null-sink][modules/module-null-sink.c:203 thread_func()] Thread starting up

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Device added for object /org/pulseaudio/core1/source0

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Source added for object /org/pulseaudio/core1/source0

D: [pulseaudio][modules/module-device-restore.c:862 sink_put_hook_callback()] Could not set format on sink auto_null

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Device added for object /org/pulseaudio/core1/sink0

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Sink added for object /org/pulseaudio/core1/sink0

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-null-sink" (index: #9; argument: "sink_name=auto_null sink_properties='device.description="Dummy Output"'").

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-always-sink" (index: #8; argument: "").

D: [pulseaudio][modules/module-suspend-on-idle.c:114 restart()] Sink auto_null becomes idle, timeout in 5 seconds.

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-suspend-on-idle" (index: #10; argument: "").

I: [pulseaudio][pulsecore/module.c:179 pa_module_load()] Loaded "module-position-event-sounds" (index: #11; argument: "").

D: [pulseaudio][pulsecore/dbus-util.c:290 pa_dbus_wrap_connection_new()] Successfully connected to D-Bus system bus 4bfa047e6e2412c2d508e0690000000d as :1.6

D: [pulseaudio][daemon/main.c:376 register_dbus_name()] Got org.pulseaudio.Server!

I: [pulseaudio][daemon/main.c:1147 main()] Daemon startup complete.

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module7

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module9

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module8

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module10

D: [pulseaudio][pulsecore/protocol-dbus.c:799 pa_dbus_protocol_add_interface()] Interface org.PulseAudio.Core1.Module added for object /org/pulseaudio/core1/module11

I: [pulseaudio][modules/module-suspend-on-idle.c:92 timeout_cb()] Sink auto_null idle for too long, suspending ...

D: [pulseaudio][pulsecore/sink.c:879 pa_sink_suspend()] Suspend cause of sink auto_null is 0x0004, suspending

D: [pulseaudio][pulsecore/core.c:256 pa_core_maybe_vacuum()] Hmm, no streams around, trying to vacuum.

[dmitrypozhidaev]

The problem was in permissions

As told Gentoowiki:

If the only playback device is the Dummy Output, PulseAudio can not access your sound devices. Either the user has no permissions (see section Permissions or another program blocks the access. Try:

user $fuser -v /dev/snd/*

So need do commands for solve

# chmod 0777 /dev/snd/controlC*

# chmod 0777 /dev/snd/pc*

Becouse was messages in log:

D: [pulseaudio][pulsecore/module.c:77 pa_module_exists()] Checking for existence of '/usr/lib/pulse-5.0/modules/module-udev-detect.so': success

D: [pulseaudio][modules/module-udev-detect.c:296 verify_access()] /dev/snd/controlC2 is accessible: no

D: [pulseaudio][modules/module-udev-detect.c:296 verify_access()] /dev/snd/controlC0 is accessible: no

D: [pulseaudio][modules/module-udev-detect.c:296 verify_access()] /dev/snd/controlC1 is accessible: no

I: [pulseaudio][modules/module-udev-detect.c:801 module_udev_detect_LTX_pa__init()] Found 3 cards.

[igorpadykov]

Hi Dmitry

thank for sharing that, just for completeness one can

also look at attached document sect.7.4 Pulseaudio input/output settings

from L3.14.28_1.0.0_LINUX_DOCS

Best regards

igor