我的 PC 声音突然变差（没有低音，整体质量很差）。我停止并重新启动 pulseaudo，由于没有任何改善，我运行sudo apt install pulseaudio alsa-base alsa-utils并sudo alsa force-reload。现在根本没有声音，甚至在测试声音中也没有。我有
$ inxi -SMA
System:
Host: juggernaut Kernel: 5.11.0-49-generic x86_64 bits: 64
Desktop: GNOME 3.38.4 Distro: Ubuntu 21.04 (Hirsute Hippo)
Machine:
Type: Desktop System: MSI product: MS-7693 v: 4.0
serial: <superuser required>
Mobo: MSI model: 970 GAMING (MS-7693) v: 4.0 serial: <superuser required>
BIOS: American Megatrends v: 22.4 date: 12/21/2015
Audio:
Device-1: AMD SBx00 Azalia driver: snd_hda_intel
Device-2: NVIDIA GK208 HDMI/DP Audio driver: snd_hda_intel
Sound Server: ALSA v: k5.11.0-49-generic
我怎样才能恢复声音？
谢谢