________________
> pulseaudio_ps_do
ubuntu      7936  0.0  0.4 1934096 17708 ?       S<sl 18:11   0:00 /usr/bin/pulseaudio --daemonize=no --log-target=journal
root       10101  0.0  0.0   2968   820 ?        S    18:20   0:00 grep pulseaudio
________________
> which pulseaudio
/usr/bin/pulseaudio
________________
> pidof pulseaudio
7936
________________
> pulseaudio --version
pulseaudio 14.2
________________
> pactl info
Connection failure: Connection refused
pa_context_connect() failed: Connection refused
________________
> pactl list
Connection failure: Connection refused
pa_context_connect() failed: Connection refused
________________
> cat /etc/pulse/daemon.conf
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.

## Configuration file for the PulseAudio daemon. See pulse-daemon.conf(5) for
## more information. Default values are commented out.  Use either ; or # for
## commenting.

; daemonize = no
; fail = yes
; allow-module-loading = yes
; allow-exit = yes
; use-pid-file = yes
; system-instance = no
; local-server-type = user
; enable-shm = yes
; enable-memfd = yes
; shm-size-bytes = 0 # setting this 0 will use the system-default, usually 64 MiB
; lock-memory = no
; cpu-limit = no

; high-priority = yes
; nice-level = -11

; realtime-scheduling = yes
; realtime-priority = 5

; exit-idle-time = 20
; scache-idle-time = 20

; dl-search-path = (depends on architecture)

; load-default-script-file = yes
; default-script-file = /etc/pulse/default.pa

; log-target = auto
; log-level = notice
; log-meta = no
; log-time = no
; log-backtrace = 0

; resample-method = speex-float-1
; avoid-resampling = false
; enable-remixing = yes
; remixing-use-all-sink-channels = yes
; remixing-produce-lfe = no
; remixing-consume-lfe = no
; lfe-crossover-freq = 0

; flat-volumes = no

; rescue-streams = yes

; rlimit-fsize = -1
; rlimit-data = -1
; rlimit-stack = -1
; rlimit-core = -1
; rlimit-as = -1
; rlimit-rss = -1
; rlimit-nproc = -1
; rlimit-nofile = 256
; rlimit-memlock = -1
; rlimit-locks = -1
; rlimit-sigpending = -1
; rlimit-msgqueue = -1
; rlimit-nice = 31
; rlimit-rtprio = 9
; rlimit-rttime = 200000

; default-sample-format = s16le
; default-sample-rate = 44100
; alternate-sample-rate = 48000
; default-sample-channels = 2
; default-channel-map = front-left,front-right

; default-fragments = 4
; default-fragment-size-msec = 25

; enable-deferred-volume = yes
deferred-volume-safety-margin-usec = 1
; deferred-volume-extra-delay-usec = 0
________________
> cat /etc/pulse/client.conf
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.

## Configuration file for PulseAudio clients. See pulse-client.conf(5) for
## more information. Default values are commented out.  Use either ; or # for
## commenting.

; default-sink =
; default-source =
; default-server =
; default-dbus-server =

; autospawn = yes
; daemon-binary = /usr/bin/pulseaudio
; extra-arguments = --log-target=syslog

; cookie-file =

; enable-shm = yes
; shm-size-bytes = 0 # setting this 0 will use the system-default, usually 64 MiB

; auto-connect-localhost = no
; auto-connect-display = no
________________
> cat /etc/pulse/default.pa
#!/usr/bin/pulseaudio -nF
#
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.

# This startup script is used only if PulseAudio is started per-user
# (i.e. not in system mode)

.fail

### Automatically restore the volume of streams and devices
load-module module-device-restore
load-module module-stream-restore
load-module module-card-restore

### Automatically augment property information from .desktop files
### stored in /usr/share/application
load-module module-augment-properties

### Should be after module-*-restore but before module-*-detect
load-module module-switch-on-port-available

### Use hot-plugged devices like Bluetooth or USB automatically (LP: #1702794)
.ifexists module-switch-on-connect.so
load-module module-switch-on-connect
.endif

### Load audio drivers statically
### (it's probably better to not load these drivers manually, but instead
### use module-udev-detect -- see below -- for doing this automatically)
#load-module module-alsa-sink
#load-module module-alsa-source device=hw:1,0
#load-module module-oss device="/dev/dsp" sink_name=output source_name=input
#load-module module-oss-mmap device="/dev/dsp" sink_name=output source_name=input
#load-module module-null-sink
#load-module module-pipe-sink

### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect tsched=0
.else
### Use the static hardware detection module (for systems that lack udev support)
load-module module-detect
.endif

### Automatically connect sink and source if JACK server is present
.ifexists module-jackdbus-detect.so
.nofail
load-module module-jackdbus-detect channels=2
.fail
.endif

### Automatically load driver modules for Bluetooth hardware
.ifexists module-bluetooth-policy.so
load-module module-bluetooth-policy
.endif

.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
.endif

### Load several protocols
.ifexists module-esound-protocol-unix.so
load-module module-esound-protocol-unix
.endif
load-module module-native-protocol-unix

### Network access (may be configured with paprefs, so leave this commented
### here if you plan to use paprefs)
#load-module module-esound-protocol-tcp
#load-module module-native-protocol-tcp
#load-module module-zeroconf-publish

### Load the RTP receiver module (also configured via paprefs, see above)
#load-module module-rtp-recv

### Load the RTP sender module (also configured via paprefs, see above)
#load-module module-null-sink sink_name=rtp format=s16be channels=2 rate=44100 sink_properties="device.description='RTP Multicast Sink'"
#load-module module-rtp-send source=rtp.monitor

### Load additional modules from GSettings. This can be configured with the paprefs tool.
### Please keep in mind that the modules configured by paprefs might conflict with manually
### loaded modules.
.ifexists module-gsettings.so
.nofail
load-module module-gsettings
.fail
.endif


### Automatically restore the default sink/source when changed by the user
### during runtime
### NOTE: This should be loaded as early as possible so that subsequent modules
### that look up the default sink/source get the right value
load-module module-default-device-restore

### Make sure we always have a sink around, even if it is a null sink.
load-module module-always-sink

### Honour intended role device property
load-module module-intended-roles

### Automatically suspend sinks/sources that become idle for too long
load-module module-suspend-on-idle

### If autoexit on idle is enabled we want to make sure we only quit
### when no local session needs us anymore.
.ifexists module-console-kit.so
load-module module-console-kit
.endif
.ifexists module-systemd-login.so
load-module module-systemd-login
.endif

### Enable positioned event sounds
load-module module-position-event-sounds

### Cork music/video streams when a phone stream is active
load-module module-role-cork

### Block audio recording for snap confined packages unless they have
### the "pulseaudio" or "audio-record" interfaces plugged.
.ifexists module-snap-policy.so
load-module module-snap-policy
.endif

### Modules to allow autoloading of filters (such as echo cancellation)
### on demand. module-filter-heuristics tries to determine what filters
### make sense, and module-filter-apply does the heavy-lifting of
### loading modules and rerouting streams.
load-module module-filter-heuristics
load-module module-filter-apply

### Make some devices default
#set-default-sink output
#set-default-source input
________________
> cat /etc/pulse/system.pa
#!/usr/bin/pulseaudio -nF
#
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.

# This startup script is used only if PulseAudio is started in system
# mode.

### Automatically restore the volume of streams and devices
load-module module-device-restore
load-module module-stream-restore
load-module module-card-restore

### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect
.else
### Use the static hardware detection module (for systems that lack udev/hal support)
load-module module-detect
.endif

### Load several protocols
.ifexists module-esound-protocol-unix.so
load-module module-esound-protocol-unix
.endif
load-module module-native-protocol-unix

### Automatically restore the default sink/source when changed by the user
### during runtime
### NOTE: This should be loaded as early as possible so that subsequent modules
### that look up the default sink/source get the right value
load-module module-default-device-restore

### Make sure we always have a sink around, even if it is a null sink.
load-module module-always-sink

### Automatically suspend sinks/sources that become idle for too long
load-module module-suspend-on-idle

### Enable positioned event sounds
load-module module-position-event-sounds
________________
> ls -alt /dev/snd/*
crw-rw----+ 1 root audio 116,  5 Apr  7 18:57 /dev/snd/controlC1
crw-rw----+ 1 root audio 116,  3 Apr  7 18:57 /dev/snd/controlC0
crw-rw----+ 1 root audio 116,  2 Apr  7 18:57 /dev/snd/pcmC0D0p
crw-rw----+ 1 root audio 116,  4 Apr  7 18:57 /dev/snd/pcmC1D0p
crw-rw----+ 1 root audio 116,  1 Apr  7 18:57 /dev/snd/seq
crw-rw----+ 1 root audio 116, 33 Apr  7 18:57 /dev/snd/timer

/dev/snd/by-path:
total 0
drwxr-xr-x 2 root root  60 Apr  7 18:57 .
lrwxrwxrwx 1 root root  12 Apr  7 18:57 platform-bcm2835_audio -> ../controlC1
drwxr-xr-x 3 root root 180 Apr  7 18:57 ..
________________
> lsof /dev/snd/*
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
      Output information may be incomplete.
COMMAND    PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
pulseaudi 7936 ubuntu   27u   CHR  116,5      0t0 1935 /dev/snd/controlC1
________________
> jacks_do
card=0
card=1
________________
> aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
samplerate
    Rate Converter Plugin Using Samplerate Library
speexrate
    Rate Converter Plugin Using Speex Resampler
jack
    JACK Audio Connection Kit
oss
    Open Sound System
pulse
    PulseAudio Sound Server
upmix
    Plugin for channel upmix (4,6,8)
vdownmix
    Plugin for channel downmix (stereo) with a simple spacialization
hw:CARD=b1,DEV=0
    bcm2835 HDMI 1, bcm2835 HDMI 1
    Direct hardware device without any conversions
plughw:CARD=b1,DEV=0
    bcm2835 HDMI 1, bcm2835 HDMI 1
    Hardware device with all software conversions
default:CARD=b1
    bcm2835 HDMI 1, bcm2835 HDMI 1
    Default Audio Device
sysdefault:CARD=b1
    bcm2835 HDMI 1, bcm2835 HDMI 1
    Default Audio Device
dmix:CARD=b1,DEV=0
    bcm2835 HDMI 1, bcm2835 HDMI 1
    Direct sample mixing device
usbstream:CARD=b1
    bcm2835 HDMI 1
    USB Stream Output
hw:CARD=Headphones,DEV=0
    bcm2835 Headphones, bcm2835 Headphones
    Direct hardware device without any conversions
plughw:CARD=Headphones,DEV=0
    bcm2835 Headphones, bcm2835 Headphones
    Hardware device with all software conversions
default:CARD=Headphones
    bcm2835 Headphones, bcm2835 Headphones
    Default Audio Device
sysdefault:CARD=Headphones
    bcm2835 Headphones, bcm2835 Headphones
    Default Audio Device
dmix:CARD=Headphones,DEV=0
    bcm2835 Headphones, bcm2835 Headphones
    Direct sample mixing device
usbstream:CARD=Headphones
    bcm2835 Headphones
    USB Stream Output
________________
> arecord -L
null
    Discard all samples (playback) or generate zero samples (capture)
samplerate
    Rate Converter Plugin Using Samplerate Library
speexrate
    Rate Converter Plugin Using Speex Resampler
jack
    JACK Audio Connection Kit
oss
    Open Sound System
pulse
    PulseAudio Sound Server
upmix
    Plugin for channel upmix (4,6,8)
vdownmix
    Plugin for channel downmix (stereo) with a simple spacialization
usbstream:CARD=b1
    bcm2835 HDMI 1
    USB Stream Output
usbstream:CARD=Headphones
    bcm2835 Headphones
    USB Stream Output
________________
> alsa_info_do
cat: /tmp/alsa-info.YzgHRYiT6r/acpidevicestatus.tmp: No such file or directory
upload=true&script=true&cardinfo=
!!################################
!!ALSA Information Script v 0.4.65
!!################################

!!Script ran on: Wed May  5 15:20:02 UTC 2021


!!Linux Distribution
!!------------------

Ubuntu 21.04 \n \l DISTRIB_ID=Ubuntu DISTRIB_DESCRIPTION="Ubuntu 21.04" NAME="Ubuntu" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 21.04" HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" UBUNTU_CODENAME=hirsute Ubuntu 20.04 LTS (Focal Fossa)


!!DMI Information
!!---------------

Manufacturer:      
Product Name:      
Product Version:   
Firmware Version:  
System SKU:        
Board Vendor:      
Board Name:        


!!ACPI Device Status Information
!!---------------



!!Kernel Information
!!------------------

Kernel release:    5.11.0-1007-raspi
Operating System:  GNU/Linux
Architecture:      aarch64
Processor:         aarch64
SMP Enabled:       Yes


!!ALSA Version
!!------------

Driver version:     k5.11.0-1007-raspi
Library version:    1.2.4
Utilities version:  1.2.4


!!Loaded ALSA modules
!!-------------------

snd_bcm2835
snd_bcm2835


!!Sound Servers on this system
!!----------------------------

Pulseaudio:
      Installed - Yes (/usr/bin/pulseaudio)
      Running - Yes


!!Soundcards recognised by ALSA
!!-----------------------------

 0 [b1             ]: bcm2835_hdmi - bcm2835 HDMI 1
                      bcm2835 HDMI 1
 1 [Headphones     ]: bcm2835_headpho - bcm2835 Headphones
                      bcm2835 Headphones


!!PCI Soundcards installed in the system
!!--------------------------------------



!!Modprobe options (Sound related)
!!--------------------------------

snd_pcsp: index=-2
snd_usb_audio: index=-2
snd_atiixp_modem: index=-2
snd_intel8x0m: index=-2
snd_via82xx_modem: index=-2
snd_atiixp_modem: index=-2
snd_intel8x0m: index=-2
snd_via82xx_modem: index=-2
snd_usb_audio: index=-2
snd_usb_caiaq: index=-2
snd_usb_ua101: index=-2
snd_usb_us122l: index=-2
snd_usb_usx2y: index=-2
snd_cmipci: mpu_port=0x330 fm_port=0x388
snd_pcsp: index=-2
snd_usb_audio: index=-2
snd_bcm2835: enable_compat_alsa=0
snd_bcm2835: enable_hdmi=1


!!Loaded sound module options
!!---------------------------

!!Module: snd_bcm2835
	enable_compat_alsa : N
	enable_hdmi : Y
	enable_headphones : Y
	force_bulk : N

!!Module: snd_bcm2835
	enable_compat_alsa : N
	enable_hdmi : Y
	enable_headphones : Y
	force_bulk : N


!!ALSA Device nodes
!!-----------------

crw-rw----+ 1 root audio 116,  3 Apr  7 18:57 /dev/snd/controlC0
crw-rw----+ 1 root audio 116,  5 Apr  7 18:57 /dev/snd/controlC1
crw-rw----+ 1 root audio 116,  2 Apr  7 18:57 /dev/snd/pcmC0D0p
crw-rw----+ 1 root audio 116,  4 Apr  7 18:57 /dev/snd/pcmC1D0p
crw-rw----+ 1 root audio 116,  1 Apr  7 18:57 /dev/snd/seq
crw-rw----+ 1 root audio 116, 33 Apr  7 18:57 /dev/snd/timer

/dev/snd/by-path:
total 0
drwxr-xr-x 2 root root  60 Apr  7 18:57 .
drwxr-xr-x 3 root root 180 Apr  7 18:57 ..
lrwxrwxrwx 1 root root  12 Apr  7 18:57 platform-bcm2835_audio -> ../controlC1


!!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

ARECORD

**** List of CAPTURE Hardware Devices ****

!!Amixer output
!!-------------

!!-------Mixer controls for card b1

Card hw: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 hw: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 -1543 [82%] [-15.43dB] [off]


!!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 -1543
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '-10239 - 400'
			dbmin -9999999
			dbmax 400
			dbvalue.0 -1543
		}
	}
	control.2 {
		iface MIXER
		name 'Headphone Playback Switch'
		value false
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
}
--endcollapse--


!!All Loaded Modules
!!------------------

ac97_bus
aes_arm64
af_alg
algif_hash
algif_skcipher
async_memcpy
async_pq
async_raid6_recov
async_tx
async_xor
autofs4
bcm2835_codec
bcm2835_gpiomem
bcm2835_isp
bcm2835_mmal_vchiq
bcm2835_v4l2
blake2b_generic
bluetooth
bnep
brcmfmac
brcmutil
btbcm
btintel
btqca
btrfs
btrtl
btsdio
cec
cfg80211
cmac
crct10dif_ce
dm_multipath
drm
drm_kms_helper
ecc
ecdh_generic
fb_sys_fops
gpu_sched
hci_uart
hid_generic
hid_logitech_dj
hid_logitech_hidpp
input_leds
ip_tables
joydev
libcrc32c
linear
lp
mc
multipath
nvmem_rmem
parport
phy_generic
ppdev
raid0
raid1
raid10
raid456
raid6_pq
raspberrypi_hwmon
rfcomm
rpivid_mem
sch_fq_codel
scsi_dh_alua
scsi_dh_emc
scsi_dh_rdac
snd
snd_bcm2835
snd_compress
snd_mixer_oss
snd_pcm
snd_pcm_dmaengine
snd_pcm_oss
snd_rawmidi
snd_seq
snd_seq_device
snd_seq_dummy
snd_seq_midi
snd_seq_midi_event
snd_seq_oss
snd_soc_core
snd_timer
syscopyarea
sysfillrect
sysimgblt
uio
uio_pdrv_genirq
usbhid
v3d
v4l2_mem2mem
vc4
vc_sm_cma
videobuf2_common
videobuf2_dma_contig
videobuf2_memops
videobuf2_v4l2
videobuf2_vmalloc
videodev
x_tables
xhci_pci
xhci_pci_renesas
xor
xor_neon


!!ALSA/HDA dmesg
!!--------------

[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 996912
[    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-1:3840x2160M@30,margin_left=48,margin_right=48,margin_top=48,margin_bottom=48 smsc95xx.macaddr=DC:A6:32:0C:5B:7D vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  net.ifnames=0 dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=LABEL=writable rootfstype=ext4 elevator=deadline rootwait fixrtc quiet splash
[    0.000000] Kernel parameter elevator= does not have any effect anymore.
--
[    1.906181]  mmcblk0: p1 p2
[    2.544684] snd_pcm_dmaengine: Unknown symbol snd_pcm_format_physical_width (err -2)
[    2.544717] snd_pcm_dmaengine: Unknown symbol snd_pcm_hw_constraint_integer (err -2)
[    2.544724] snd_pcm_dmaengine: Unknown symbol snd_pcm_period_elapsed (err -2)
[    2.571108] usb_phy_generic phy: supply vcc not found, using dummy regulator
--
[   11.504713] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[   11.581315] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned.
[   11.602822] bcm2835_audio bcm2835_audio: card created with 4 channels


!!Packages installed
!!--------------------

ii  alsa-topology-conf                         1.2.4-1                                                              all          ALSA topology configuration files
ii  alsa-ucm-conf                              1.2.4-2ubuntu1                                                       all          ALSA Use Case Manager configuration files
ii  alsa-utils                                 1.2.4-1ubuntu3                                                       arm64        Utilities for configuring and using ALSA