Ubuntu 20.04.3
通常情况下，声音在我的系统中是可以工作的。在网络浏览器、系统等中。但（仅）在 Gnome 设置中的“测试扬声器”选项中不行。它（测试声音）直到昨天才可以工作，但今天就停止了。
原因会是什么呢？
我的系统：笔记本电脑 Dell Latitude 5511
$ uname -srv
Linux 5.13.0-28-generic #31~20.04.1-Ubuntu SMP Wed Jan 19 14:08:10 UTC 2022
$ sudo lspci -vv | grep -i audio
00:1f.3 Audio device: Intel Corporation Comet Lake PCH cAVS (prog-if 80)
$ sudo lshw -C multimedia
*-usb:3
description: Video
product: Integrated_Webcam_HD
vendor: CN0V976R8LG000CPB2XRA01
physical id: b
bus info: usb@1:b
version: 82.56
serial: 200901010001
capabilities: usb-2.01
configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s
*-multimedia
description: Audio device
product: Comet Lake PCH cAVS
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=snd_hda_intel latency=32
resources: irq:178 memory:cc338000-cc33bfff memory:cc000000-cc0fffff
$ pactl info
Server String: /run/user/1000/pulse/native
Library Protocol Version: 33
Server Protocol Version: 33
Is Local: yes
Client Index: 45
Tile Size: 65472
User Name: krzysiek
Host Name: myhost
Server Name: pulseaudio
Server Version: 13.99.1
Default Sample Specification: s16le 2ch 44100Hz
Default Channel Map: front-left,front-right
Default Sink: alsa_output.pci-0000_00_1f.3.hdmi-stereo-extra2
Default Source: alsa_input.pci-0000_00_1f.3.analog-stereo
Cookie: 35e8:aae4
$ pactl list short
0 module-device-restore
1 module-stream-restore
2 module-card-restore
3 module-augment-properties
4 module-switch-on-port-available
5 module-switch-on-connect
6 module-udev-detect
7 module-alsa-card device_id="0" name="pci-0000_00_1f.3" card_name="alsa_card.pci-0000_00_1f.3" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1"
8 module-bluetooth-policy
9 module-bluetooth-discover
10 module-bluez5-discover
11 module-native-protocol-unix
12 module-default-device-restore
13 module-always-sink
14 module-intended-roles
15 module-suspend-on-idle
16 module-console-kit
17 module-systemd-login
18 module-position-event-sounds
19 module-role-cork
20 module-snap-policy
21 module-filter-heuristics
22 module-filter-apply
23 module-x11-publish display=:0 xauthority=/run/user/1000/gdm/Xauthority
24 module-x11-cork-request display=:0 xauthority=/run/user/1000/gdm/Xauthority
25 module-x11-xsmp display=:0 xauthority=/run/user/1000/gdm/Xauthority session_manager=local/aps00090646-mb.poland.asseco.corp:@/tmp/.ICE-unix/4554,unix/aps00090646-mb.poland.asseco.corp:/tmp/.ICE-unix/4554
2 alsa_output.pci-0000_00_1f.3.hdmi-stereo-extra2 module-alsa-card.c s16le 2ch 44100Hz SUSPENDED
1 alsa_input.pci-0000_00_1f.3.analog-stereo module-alsa-card.c s16le 2ch 44100Hz RUNNING
3 alsa_output.pci-0000_00_1f.3.hdmi-stereo-extra2.monitor module-alsa-card.c s16le 2ch 44100Hz SUSPENDED
1 1 10 protocol-native.c float32le 1ch 25Hz
0 module-systemd-login.c (null)
4 module-x11-xsmp.c (null)
5 protocol-native.c gnome-shell
6 protocol-native.c gsd-media-keys
10 protocol-native.c gnome-control-center
41 protocol-native.c msedge
46 protocol-native.c pactl
0 alsa_card.pci-0000_00_1f.3 module-alsa-card.c
答案1
当我进入终端时：
gnome-control-center
接下来：声音-->测试扬声器，在我的终端我得到输出：
(gnome-control-center:9338): sound-cc-panel-WARNING **: 15:57:30.442: Failed to play sound: No such driver
接下来我将其粘贴到谷歌搜索并在网页上找到了解决方案https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1879989/comments/5 该问题是由于错过 libcanberra-pulse 引起的。
sudo apt install libcanberra-pulse
问题已解决。测试扬声器现在可以正常工作了：)