I'm having same issue, I was never able to solve it, I tried every fix
or workaround I found without success. @cccaballero did you manage to
solve it?

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https://bugs.launchpad.net/bugs/1878007

Title:
   Ubuntu 20.04 freeze on Dell inspiron 7373 when screen is turned off

Status in linux package in Ubuntu:
  Expired

Bug description:
  This issue is happening with Ubuntu 18.04 and 20.04 in a Dell Inspiron
  7373. When the screen is turned off (so, the suspend or screen lock
  features are affected), the system freeze and I need to force the
  laptop turn off and on again. There are some cases when it turn off
  the screen without issues, but most of the time it freezes. Even
  "SysRq REISUB" does not work for rebooting when system crash. I can
  reproduce the issue using `xset dpms force off`.

  Initially this bug report was filled thinking it was a suspend issue:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1832144

  Syslog or systemd journal does not provide any error information about
  the crash.

  "lsb_release -rd" output:
  Description: Ubuntu 20.04 LTS
  Release: 20.04
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  cccaballero   2023 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2019-06-09 (344 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 8087:0a2a Intel Corp. 
   Bus 001 Device 002: ID 0bda:58f5 Realtek Semiconductor Corp. 
Integrated_Webcam_HD
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Inspiron 7373
  Package: linux (not installed)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-29-generic 
root=UUID=d8203f53-c2e5-4934-8616-0a71507c9190 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-29-generic N/A
   linux-backports-modules-5.4.0-29-generic  N/A
   linux-firmware                            1.187
  Tags:  focal
  Uname: Linux 5.4.0-29-generic x86_64
  UpgradeStatus: Upgraded to focal on 2020-05-02 (16 days ago)
  UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/06/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.15.0
  dmi.board.name: 0JW0D6
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 31
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.15.0:bd09/06/2019:svnDellInc.:pnInspiron7373:pvr:rvnDellInc.:rn0JW0D6:rvrA00:cvnDellInc.:ct31:cvr:
  dmi.product.family: Inspiron
  dmi.product.name: Inspiron 7373
  dmi.product.sku: 07EB
  dmi.sys.vendor: Dell Inc.

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