alsaに問題があります。サウンドカードを認識していないようです。以前はこのような問題はありませんでした...
!!################################
!!ALSA Information Script v 0.4.64
!!################################
!!Script ran on: Mon Jan 6 18:28:00 UTC 2020
!!Linux Distribution
!!------------------
ID_LIKE=arch
!!DMI Information
!!---------------
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: B450M DS3H
Product Version: Default string
Firmware Version: F41
Board Vendor: Gigabyte Technology Co., Ltd.
Board Name: B450M DS3H-CF
!!ACPI Device Status Information
!!---------------
/sys/bus/acpi/devices/AMDI0030:00/status 15
/sys/bus/acpi/devices/AMDIF030:00/status 15
/sys/bus/acpi/devices/LNXTHERM:00/status 11
/sys/bus/acpi/devices/PNP0103:00/status 15
/sys/bus/acpi/devices/PNP0501:00/status 15
/sys/bus/acpi/devices/PNP0A08:00/status 15
/sys/bus/acpi/devices/PNP0C01:00/status 15
/sys/bus/acpi/devices/PNP0C02:01/status 15
/sys/bus/acpi/devices/PNP0C02:03/status 15
/sys/bus/acpi/devices/PNP0C0C:00/status 11
/sys/bus/acpi/devices/PNP0C0F:00/status 11
/sys/bus/acpi/devices/PNP0C0F:01/status 11
/sys/bus/acpi/devices/PNP0C0F:02/status 11
/sys/bus/acpi/devices/PNP0C0F:03/status 11
/sys/bus/acpi/devices/PNP0C0F:04/status 11
/sys/bus/acpi/devices/PNP0C0F:05/status 11
/sys/bus/acpi/devices/PNP0C0F:06/status 11
/sys/bus/acpi/devices/PNP0C0F:07/status 11
/sys/bus/acpi/devices/PNP0C14:01/status 11
!!Kernel Information
!!------------------
Kernel release: 5.4.6-2-MANJARO
Operating System: GNU/Linux
Architecture: x86_64
Processor: unknown
SMP Enabled: Yes
!!ALSA Version
!!------------
Driver version: k5.4.6-2-MANJARO
Library version: 1.2.1.2
Utilities version: 1.2.1
!!Loaded ALSA modules
!!-------------------
!!Sound Servers on this system
!!----------------------------
Pulseaudio:
Installed - Yes (/usr/bin/pulseaudio)
Running - Yes
Jack:
Installed - Yes (/usr/bin/jackd)
Running - No
!!Soundcards recognised by ALSA
!!-----------------------------
--- no soundcards ---
!!PCI Soundcards installed in the system
!!--------------------------------------
07:00.1 Audio device: NVIDIA Corporation GP107GL High Definition Audio Controller (rev a1)
09:00.3 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) HD Audio Controller
!!Advanced information - PCI Vendor/Device/Subsystem ID's
!!-------------------------------------------------------
07:00.1 0403: 10de:0fb9 (rev a1)
Subsystem: 10de:11c0
--
09:00.3 0403: 1022:1457
Subsystem: 1458:a182
!!Loaded sound module options
!!---------------------------
!!ALSA Device nodes
!!-----------------
crw-rw----+ 1 root audio 116, 1 Jan 6 18:50 /dev/snd/seq
crw-rw----+ 1 root audio 116, 33 Jan 6 18:50 /dev/snd/timer
!!Aplay/Arecord output
!!--------------------
APLAY
aplay: device_list:272: no soundcards found...
ARECORD
arecord: device_list:272: no soundcards found...
!!Amixer output
!!-------------
!!Alsactl output
!!--------------
--startcollapse--
--endcollapse--
!!All Loaded Modules
!!------------------
Module
ccm
fuse
squashfs
loop
rtl8192ee
btcoexist
rtl_pci
rtlwifi
edac_mce_amd
mac80211
kvm_amd
snd_intel_nhlt
kvm
snd_hda_codec
irqbypass
cfg80211
r8169
snd_hda_core
crct10dif_pclmul
crc32_pclmul
snd_hwdep
ghash_clmulni_intel
realtek
uinput
mousedev
rfkill
snd_pcm
joydev
input_leds
aesni_intel
nvidia_drm
wmi_bmof
snd_timer
nvidia_modeset
snd
crypto_simd
ccp
cryptd
sp5100_tco
glue_helper
pcspkr
soundcore
i2c_piix4
k10temp
libarc4
libphy
rng_core
drm_kms_helper
wmi
drm
pinctrl_amd
gpio_amdpt
evdev
mac_hid
acpi_cpufreq
agpgart
syscopyarea
sysfillrect
sysimgblt
fb_sys_fops
nvidia
ipmi_devintf
ipmi_msghandler
crypto_user
ip_tables
x_tables
ext4
crc32c_generic
crc16
mbcache
jbd2
hid_logitech_hidpp
hid_logitech_dj
hid_generic
usbhid
hid
sd_mod
ahci
libahci
libata
crc32c_intel
xhci_pci
scsi_mod
xhci_hcd
!!ALSA/HDA dmesg
!!--------------
➜ ~ alsactl init
alsactl: sysfs_init:48: sysfs path '/sys' is invalid
alsactl: init:1759: No soundcards found...
➜ ~ alsamixer
le mixeur ne peut pas être ouvert: Aucun fichier ou dossier de ce type
[redgl0w redgl0w]# rmmod snd-hda-intel; modprobe snd-hda-intel; dmesg | tail
rmmod: ERROR: Module snd_hda_intel is not currently loaded
modprobe: ERROR: Error running install command for snd_hda_intel
modprobe: ERROR: could not insert 'snd_hda_intel': Operation not permitted
[ 57.223367] audit: type=1100 audit(1578342370.883:68): pid=2098 uid=1000 auid=1000 ses=2 subj==unconfined msg='op=PAM:authentication grantors=pam_unix,pam_permit acct="redgl0w" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/0 res=success'
[ 57.223711] audit: type=1101 audit(1578342370.886:69): pid=2098 uid=1000 auid=1000 ses=2 subj==unconfined msg='op=PAM:accounting grantors=pam_unix,pam_permit,pam_time acct="redgl0w" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/0 res=success'
[ 57.224131] audit: type=1110 audit(1578342370.886:70): pid=2098 uid=0 auid=1000 ses=2 subj==unconfined msg='op=PAM:setcred grantors=pam_unix,pam_permit acct="root" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/0 res=success'
[ 57.229977] audit: type=1105 audit(1578342370.890:71): pid=2098 uid=0 auid=1000 ses=2 subj==unconfined msg='op=PAM:session_open grantors=pam_limits,pam_unix,pam_permit acct="root" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/0 res=success'
[ 57.232712] audit: type=1106 audit(1578342370.893:72): pid=2098 uid=0 auid=1000 ses=2 subj==unconfined msg='op=PAM:session_close grantors=pam_limits,pam_unix,pam_permit acct="root" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/0 res=success'
[ 57.232852] audit: type=1104 audit(1578342370.893:73): pid=2098 uid=0 auid=1000 ses=2 subj==unconfined msg='op=PAM:setcred grantors=pam_unix,pam_permit acct="root" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/0 res=success'
[ 61.145820] audit: type=1101 audit(1578342374.806:74): pid=2107 uid=1000 auid=1000 ses=2 subj==unconfined msg='op=PAM:accounting grantors=pam_unix,pam_permit,pam_time acct="redgl0w" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/0 res=success'
[ 61.146060] audit: type=1110 audit(1578342374.806:75): pid=2107 uid=0 auid=1000 ses=2 subj==unconfined msg='op=PAM:setcred grantors=pam_unix,pam_permit,pam_env acct="root" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/0 res=success'
[ 61.151701] audit: type=1105 audit(1578342374.813:76): pid=2107 uid=0 auid=1000 ses=2 subj==unconfined msg='op=PAM:session_open grantors=pam_limits,pam_unix,pam_permit acct="root" exe="/usr/bin/sudo" hostname=? addr=? terminal=/dev/pts/0 res=success'
[ 61.160687] audit: type=1100 audit(1578342374.823:77): pid=2108 uid=0 auid=1000 ses=2 subj==unconfined msg='op=PAM:authentication grantors=pam_rootok acct="root" exe="/usr/bin/su" hostname=redgl0w addr=? terminal=pts/0 res=success'
[redgl0w redgl0w]#
ありがとうございます！
答え1
modprobe.confsnd-intelの行を削除しました。
install snd_hda_intel /bin/false
これで問題が解決しました。