[Inspiron 5391, Realtek ALC3204] Sound stopped to work, "error : DSP panic!" in dmesg

Sound worked, but accidentally stopped to work at all. Just before it I had plugged and unplugged HDMI display (but without sound via HDMI). Only restart helped. Here is dmesg output while the problem.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
Uname: Linux 5.4.0-33-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: username 4612 F.... pulseaudio
 /dev/snd/pcmC0D0p: username 4612 F...m pulseaudio
 /dev/snd/pcmC0D6c: username 4612 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Wed Jun 3 20:42:33 2020
InstallationDate: Installed on 2020-05-28 (5 days ago)
InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: sof-hda-dsp - sof-hda-dsp
Symptom_Jack: Speaker, Internal
Symptom_PulseAudioLog:
 июн 03 20:04:56 username-5391 dbus-daemon[3386]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.28' (uid=114 pid=4302 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo" label="unconfined")
 июн 03 20:04:59 username-5391 systemd[4295]: pulseaudio.service: Succeeded.
 июн 03 20:05:09 username-5391 systemd[4295]: pulseaudio.socket: Succeeded.
Symptom_Type: Sound works for a while, then breaks
Title: [Inspiron 5391, Realtek ALC3204, Speaker, Internal] fails after a while
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/21/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.0
dmi.board.name: 07DM2C
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.3.0:bd11/21/2019:svnDellInc.:pnInspiron5391:pvr:rvnDellInc.:rn07DM2C:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Inspiron
dmi.product.name: Inspiron 5391
dmi.product.sku: 096E
dmi.sys.vendor: Dell Inc.