Alright, here we go.

I have the kernel listed above installed: Linux shadeball
5.2.0-9-generic #10~bfo110511 SMP Tue Jul 16 13:17:28 CST 2019 x86_64
x86_64 x86_64 GNU/Linux

I then went into the Power settings and turned Dim Screen When Inactive
to off, Blank Screen to Never and so far there have been basically no
flickers. There may have been one or two, but I can't confirm that I saw
them and cannot reproduce them.

I have tried it both on AC power and on battery, and with success on
both.

Thank you so much!

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https://bugs.launchpad.net/bugs/1827790

Title:
  Dell XPS 13 9380 - Screen brightness flashes

Status in gnome-settings-daemon package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  I have a new 2019 Dell XPS 13 (9380). I ordered the official Ubuntu
  edition from Dell which came with 18.04, but I've since wiped it and
  installed 19.04 from a fresh ISO download. This is the non-touch non-
  4K version (13-inch 1080p).

  Every so often (maybe a couple of times per minute), the screen
  flashes brighter, as if the brightness has been turned up momentarily
  and then back down again.

  I previously had an issue with the brightness / colours changing
  slightly when I opened menus or if the screen content changed
  slightly, but I fixed that by disabling Dynamic Brightness in the
  BIOS. It is definitely a better experience with that turned off.

  However the screen flashing still persists.

  I booted a live image of Fedora 30 now that it has been released, and
  so far I have not seen the screen flashing, so I do not think the
  hardware is faulty.

  I ran apport-bug, so hopefully the collected information has been
  attached.

  Thank you.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: xorg 1:7.7+19ubuntu12
  ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
  Uname: Linux 5.0.0-13-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Sun May  5 15:59:45 2019
  DistUpgraded: Fresh install
  DistroCodename: disco
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (prog-if 00 
[VGA controller])
     Subsystem: Dell UHD Graphics 620 (Whiskey Lake) [1028:08af]
  InstallationDate: Installed on 2019-04-28 (6 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  MachineType: Dell Inc. XPS 13 9380
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-13-generic 
root=UUID=fcb75d61-4e46-4391-8800-ccef7ff04f70 ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/29/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.3.2
  dmi.board.name: 0KTW76
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.3.2:bd03/29/2019:svnDellInc.:pnXPS139380:pvr:rvnDellInc.:rn0KTW76:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9380
  dmi.product.sku: 08AF
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.97-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.2-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.4-1ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20180925-2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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