This is pretty similar to audio issue we've encountered before.
Could you open sound setting and play test sound to see if this issue happens 
while playing sounds?

BTW, could you also check if it lists the same audio output devices when
the dock cable is plugged at left side and right side.

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https://bugs.launchpad.net/bugs/1884001

Title:
  [Ice Lake] External 4k monitor periodically shows black screen

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have a 4k dell monitor attached to a Dell XPS13 (2020). The connection is:
  Computer -> Thunderbolt (USBC) Cable -> Caldigit Thunderbolt Hub -> 
Thunderbolt-to-Displayport Cable -> Monitor.

  Note: The Thunderbolt cable from the Caldigit hub is powered. I have a
  keyboard, mouse, monitor etc all attached to the thunderbolt hub. So
  there is just one cable connected to the laptop, which is nice.

  If I wake my laptop, everything's fine for a few minutes, then
  periodically the screen goes black for a second or two, then back to
  display. This happens with increasing frequency. If I log out and log
  back in, the problem is usually resolved. Sometimes I have to unplug
  and replug the hub from my laptop.

  I assume this is xorg-related because logging out and back in
  effectively restarts X. But X might not be the problem, it might be
  thunderbolt-related.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41
  Uname: Linux 5.4.0-37-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jun 17 18:22:45 2020
  DistUpgraded: 2020-04-28 11:49:08,077 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
  DistributionChannelDescriptor:
   # This is the distribution channel descriptor for the OEM CDs
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-bionic-amd64-20190418-59+beaver-osp1+X00
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Iris Plus Graphics G7 [8086:8a52] (rev 07) (prog-if 00 
[VGA controller])
     Subsystem: Dell Iris Plus Graphics G7 [1028:096d]
  InstallationDate: Installed on 2020-03-14 (95 days ago)
  InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 
20190418-12:10
  MachineType: Dell Inc. XPS 13 9300
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/zsh
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-37-generic 
root=UUID=15b70d1f-6d44-4cea-a1ad-10b0924bc69b ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to focal on 2020-04-28 (50 days ago)
  dmi.bios.date: 05/08/2020
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.0.11
  dmi.board.name: 077Y9N
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.0.11:bd05/08/2020:svnDellInc.:pnXPS139300:pvr:rvnDellInc.:rn077Y9N:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9300
  dmi.product.sku: 096D
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.4-2ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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