Dear fellow readers,
I found the culprit for my ignored asound.conf.
The changes were not ignored, they just did not show under aplay -L.
The reason was “defaults.namehint.showall" was set to off in /usr/share/alsa/alsa.conf.
I hope this is useful to some other poor sap some day. This took me days to nail down. Makes one wish this had been documented.
Best,
Guillaume
> On 29 Mar 2023, at 19:14, Guillaume Khayat <guillaume.kh.alt@xxxxxxxxx> wrote:
>
> Dear readers,
>
> I'm running my own distro built w/ Yocto and my /etc/asound.conf is seemingly ignored entirely.
>
> I have been working at figuring out why for 3 days already and am running out of ideas. I would welcome any help the readers of this list can kindly spare.
>
> The hardware platform is a Raspberry Pi 3 B+ with a Hifiberrry DAC connected over I2S.
> The software environment is a custom Linux distro built w/ Yocto. Kernel is 5.15.34. ALSA is 1.2.6. No other audio backend (e.g. Pipewire) is installed.
> The system has 3 working soundcards (see aplay -l output below), with matching PCMs.
>
> I reproduce the issue with a small simple /etc/asound.conf containing :
> pcm.volumioHw {
> type hw
> card "sndrpihifiberry"
> }
>
> Thank you for your time & consideration,
>
> Guillaume
>
> ——————————————————————————
>
>
> I have tried quite a few things already:
>
> 1) setting CONFIG_SND_DEBUG=y & CONFIG_SND_DEBUG_VERBOSE=y and making sure /sys/module/snd/parameters/debug = 2
> —> Not much in journaldNothing relevant as far as I can tell
>
> 2) checking if the soundcard's kernel module has a debug flag which we can enable with "modinfo -p”
> —> no option available for snd_soc_rpi_simple_soundcard
>
> 3) checking every path listed in /usr/share/alsa/alsa.conf for conflicting conf files
> • /var/lib/alsa/conf.d
> • /usr/etc/alsa/conf.d
> • /etc/alsa/conf.d
> • /etc/asound.conf
> • /usr/etc/asound.conf
> • ~/.asoundrc
> • $XDG_CONFIG_HOME/alsa/asoundrc
> —> only my /etc/asound.conf exists
>
>
> ——————————————————————————
>
>
> There are also things I HAVEN’T tried:
> 1) stracing whatever handles conf files parsing. I don’t know what process to actually strace.
> 2) enabling kernel dynamic debug. I don’t know what module to enable debug logs for.
>
>
>
> ——————————————————————————
>
>
> Here is the output of alsa-info.sh for further reference:
>
> upload=true&script=true&cardinfo=
> !!################################
> !!ALSA Information Script v 0.5.1
> !!################################
>
> !!Script ran on: Wed Mar 29 15:36:21 UTC 2023
>
>
> !!Linux Distribution
> !!------------------
>
>
>
>
> !!DMI Information
> !!---------------
>
> Manufacturer:
> Product Name:
> Product Version:
> Firmware Version:
> System SKU:
> Board Vendor:
> Board Name:
>
>
> !!ACPI Device Status Information
> !!---------------
>
>
>
> !!Kernel Information
> !!------------------
>
> Kernel release: 5.15.34-v8
> Operating System: GNU/Linux
> Architecture: aarch64
> Processor: unknown
> SMP Enabled: Yes
>
>
> !!ALSA Version
> !!------------
>
> Driver version: k5.15.34-v8
> Library version: 1.2.6.1
> Utilities version: 1.2.6
>
>
> !!Loaded ALSA modules
> !!-------------------
>
>
>
> !!Sound Servers on this system
> !!----------------------------
>
> No sound servers found.
>
>
> !!Soundcards recognised by ALSA
> !!-----------------------------
>
> 0 [b1 ]: bcm2835_hdmi - bcm2835 HDMI 1
> bcm2835 HDMI 1
> 1 [Headphones ]: bcm2835_headpho - bcm2835 Headphones
> bcm2835 Headphones
> 2 [sndrpihifiberry]: RPi-simple - snd_rpi_hifiberry_dac
> snd_rpi_hifiberry_dac
>
>
> !!Modprobe options (Sound related)
> !!--------------------------------
>
> snd_bcm2835: enable_compat_alsa=0
> snd_bcm2835: enable_hdmi=1
>
>
> !!Loaded sound module options
> !!---------------------------
>
>
> !!Sysfs card info
> !!---------------
>
> !!Card: /sys/class/sound/card0
> Driver: /sys/bus/platform/drivers/bcm2835_audio
> Tree:
> /sys/class/sound/card0
> |-- controlC0
> | |-- dev
> | |-- device -> ../../card0
> | |-- power
> | |-- subsystem -> ../../../../../../../../class/sound
> | `-- uevent
> |-- device -> ../../../bcm2835_audio
> |-- id
> |-- number
> |-- pcmC0D0p
> | |-- dev
> | |-- device -> ../../card0
> | |-- pcm_class
> | |-- power
> | |-- subsystem -> ../../../../../../../../class/sound
> | `-- uevent
> |-- power
> | |-- autosuspend_delay_ms
> | |-- control
> | |-- runtime_active_time
> | |-- runtime_status
> | `-- runtime_suspended_time
> |-- subsystem -> ../../../../../../../class/sound
> `-- uevent
>
> !!Card: /sys/class/sound/card1
> Driver: /sys/bus/platform/drivers/bcm2835_audio
> Tree:
> /sys/class/sound/card1
> |-- controlC1
> | |-- dev
> | |-- device -> ../../card1
> | |-- power
> | |-- subsystem -> ../../../../../../../../class/sound
> | `-- uevent
> |-- device -> ../../../bcm2835_audio
> |-- id
> |-- number
> |-- pcmC1D0p
> | |-- dev
> | |-- device -> ../../card1
> | |-- pcm_class
> | |-- power
> | |-- subsystem -> ../../../../../../../../class/sound
> | `-- uevent
> |-- power
> | |-- autosuspend_delay_ms
> | |-- control
> | |-- runtime_active_time
> | |-- runtime_status
> | `-- runtime_suspended_time
> |-- subsystem -> ../../../../../../../class/sound
> `-- uevent
>
> !!Card: /sys/class/sound/card2
> Driver: /sys/bus/platform/drivers/snd-rpi-simple
> Tree:
> /sys/class/sound/card2
> |-- controlC2
> | |-- dev
> | |-- device -> ../../card2
> | |-- power
> | |-- subsystem -> ../../../../../../../class/sound
> | `-- uevent
> |-- device -> ../../../soc:sound
> |-- id
> |-- number
> |-- pcmC2D0p
> | |-- dev
> | |-- device -> ../../card2
> | |-- pcm_class
> | |-- power
> | |-- subsystem -> ../../../../../../../class/sound
> | `-- uevent
> |-- power
> | |-- autosuspend_delay_ms
> | |-- control
> | |-- runtime_active_time
> | |-- runtime_status
> | `-- runtime_suspended_time
> |-- subsystem -> ../../../../../../class/sound
> `-- uevent
>
>
> !!ALSA Device nodes
> !!-----------------
>
> crw-rw---- 1 root audio 116, 0 Mar 29 17:07 /dev/snd/controlC0
> crw-rw---- 1 root audio 116, 32 Mar 29 17:07 /dev/snd/controlC1
> crw-rw---- 1 root audio 116, 64 Mar 29 17:07 /dev/snd/controlC2
> crw-rw---- 1 root audio 116, 16 Mar 29 17:07 /dev/snd/pcmC0D0p
> crw-rw---- 1 root audio 116, 48 Mar 29 17:07 /dev/snd/pcmC1D0p
> crw-rw---- 1 root audio 116, 80 Mar 29 17:07 /dev/snd/pcmC2D0p
> crw-rw---- 1 root audio 116, 1 Mar 29 17:07 /dev/snd/seq
> crw-rw---- 1 root audio 116, 33 Mar 29 17:07 /dev/snd/timer
>
> /dev/snd/by-path:
> drwxr-xr-x 2 root root 80 Mar 29 17:07 .
> drwxr-xr-x 3 root root 220 Mar 29 17:07 ..
> lrwxrwxrwx 1 root root 12 Mar 29 17:07 platform-bcm2835_audio -> ../controlC1
> lrwxrwxrwx 1 root root 12 Mar 29 17:07 platform-soc:sound -> ../controlC2
>
>
> !!ALSA configuration files
> !!------------------------
>
> !!System wide config file (/etc/asound.conf)
>
> pcm.volumioHw {
> type hw
> card "sndrpihifiberry"
> }
>
>
> !!Aplay/Arecord output
> !!--------------------
>
> APLAY
>
> **** List of PLAYBACK Hardware Devices ****
> card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
> Subdevices: 4/4
> Subdevice #0: subdevice #0
> Subdevice #1: subdevice #1
> Subdevice #2: subdevice #2
> Subdevice #3: subdevice #3
> card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
> Subdevices: 4/4
> Subdevice #0: subdevice #0
> Subdevice #1: subdevice #1
> Subdevice #2: subdevice #2
> Subdevice #3: subdevice #3
> card 2: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 [HifiBerry DAC HiFi pcm5102a-hifi-0]
> Subdevices: 1/1
> Subdevice #0: subdevice #0
>
> ARECORD
>
> **** List of CAPTURE Hardware Devices ****
>
> !!Amixer output
> !!-------------
>
> !!-------Mixer controls for card b1
>
> Card sysdefault:0 'b1'/'bcm2835 HDMI 1'
> Mixer name : 'Broadcom Mixer'
> Components : ''
> Controls : 2
> Simple ctrls : 1
> Simple mixer control 'HDMI',0
> Capabilities: pvolume pvolume-joined pswitch pswitch-joined
> Playback channels: Mono
> Limits: Playback -10239 - 400
> Mono: Playback 0 [96%] [0.00dB] [on]
>
> !!-------Mixer controls for card Headphones
>
> Card sysdefault:1 'Headphones'/'bcm2835 Headphones'
> Mixer name : 'Broadcom Mixer'
> Components : ''
> Controls : 2
> Simple ctrls : 1
> Simple mixer control 'Headphone',0
> Capabilities: pvolume pvolume-joined pswitch pswitch-joined
> Playback channels: Mono
> Limits: Playback -10239 - 400
> Mono: Playback -2000 [77%] [-20.00dB] [on]
>
> !!-------Mixer controls for card sndrpihifiberry
>
> Card sysdefault:2 'sndrpihifiberry'/'snd_rpi_hifiberry_dac'
> Mixer name : ''
> Components : ''
> Controls : 0
> Simple ctrls : 0
>
>
> !!Alsactl output
> !!--------------
>
> --startcollapse--
> state.b1 {
> control.1 {
> iface MIXER
> name 'HDMI Playback Volume'
> value 0
> comment {
> access 'read write'
> type INTEGER
> count 1
> range '-10239 - 400'
> dbmin -9999999
> dbmax 400
> dbvalue.0 0
> }
> }
> control.2 {
> iface MIXER
> name 'HDMI Playback Switch'
> value true
> comment {
> access 'read write'
> type BOOLEAN
> count 1
> }
> }
> }
> state.Headphones {
> control.1 {
> iface MIXER
> name 'Headphone Playback Volume'
> value -2000
> comment {
> access 'read write'
> type INTEGER
> count 1
> range '-10239 - 400'
> dbmin -9999999
> dbmax 400
> dbvalue.0 -2000
> }
> }
> control.2 {
> iface MIXER
> name 'Headphone Playback Switch'
> value true
> comment {
> access 'read write'
> type BOOLEAN
> count 1
> }
> }
> }
> state.sndrpihifiberry {
> control {
> }
> }
> --endcollapse--
>
>
> !!All Loaded Modules
> !!------------------
>
> bcm2835_codec
> bcm2835_isp
> bcm2835_mmal_vchiq
> bcm2835_v4l2
> fuse
> ipv6
> mc
> nfsd
> raspberrypi_hwmon
> regmap_mmio
> rfkill
> sch_fq_codel
> sdhci_iproc
> snd_bcm2835
> snd_soc_bcm2835_i2s
> snd_soc_pcm5102a
> snd_soc_rpi_simple_soundcard
> uio
> uio_pdrv_genirq
> v4l2_mem2mem
> vc_sm_cma
> videobuf2_common
> videobuf2_dma_contig
> videobuf2_memops
> videobuf2_v4l2
> videobuf2_vmalloc
> videodev
>
>
> !!ALSA/HDA dmesg
> !!--------------
>
> [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 249984
> [ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 video=HDMI-A-1:1920x1080M@60 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait logo.nologo
> [ 0.000000] Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes, linear)
> --
> [ 3.291709] of_cfs_init: OK
> [ 3.298933] ALSA device list:
> [ 3.304440] No soundcards found.
> [ 3.310735] Waiting for root device /dev/mmcblk0p2...
> --
> [ 6.836072] audit: type=1334 audit(1680102470.170:3): prog-id=6 op=LOAD
> [ 7.621873] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned.
> [ 7.633856] vc_sm_cma: module is from the staging directory, the quality is unknown, you have been warned.
> --
> [ 7.651720] [vc_sm_connected_init]: start
> [ 7.700969] bcm2835_audio bcm2835_audio: card created with 4 channels
> [ 7.726147] mc: Linux media interface: v0.10
> [ 7.740401] [vc_sm_connected_init]: installed successfully
> [ 7.747054] bcm2835_audio bcm2835_audio: card created with 4 channels
> [ 7.896829] videodev: Linux video capture interface: v2.00
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