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Change /etc/modprobe.d/alsa-base.conf
# Power down HDA controllers after 10 idle seconds
options snd-hda-intel model=dell-3stack
sudo alsa force-reload
In 'Sound Preferences' -> 'Hardware' set Profile -> Analog Stereo Duplex
Pulseaudio is one of those things that if you can do without it you are better off not using it. It is buggier than windowsme.
Raspberry PI 400 Distro: Raspberry Pi OS Base: Debian Sid Kernel: 5.15.69-v8+ aarch64 DE: MATE Ram 4GB Debian - "If you can't apt install something, it isn't useful or doesn't exist" My Giant Sources.list
A friend (now a very good friend) of mine helped me out. Apparently the application speech-dispatcher was installed and somehow blocked the sound system. After removing speech-dispatcher everything worked fine.