Thanks for the bug report. Please edit /etc/default/grub and change:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_psr=0"

and then run:

  sudo update-grub

and reboot.

Does that fix the problem?

** Package changed: xorg (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1945309

Title:
  Screen flickering on Ubuntu 20.04 - HP Spectre X360 with Intel Skylake
  GT2 [HD Graphics 520]

Status in Ubuntu:
  Incomplete

Bug description:
  I am using Ubuntu 20.04.3 LTS on my HP Spectre X360 with Intel Skylake
  GT2 [HD Graphics 520] and I am having flickering graphics.

  The problem sometimes happens showing grey flickering boxes 5-6 times
  in a minute, and sometimes it does not happen for 2-3 minutes.
  Overall, it annoys me quite a lot.

  I have tried decreasing the refresh rate from 60Hz to lower options,
  but that didn't work. Updating the drivers or purging Intel graphics
  didn't work either. I also tried a couple of stuff I saw online
  regarding /etc/X11/xorg.conf.d/.

  I do not have this issue on Windows, therefore it must be Ubuntu-
  related.

  When I set nomodeset on GRUB and update it, flickering disappears, but
  at the cost of my brightness adjuster and Night Light.

  As for package I have:

  apt-cache policy pkgname
  N: Unable to locate package pkgname

  dpkg -l |grep xserver-xorg-core
  ii xserver-xorg-core 2:1.20.11-1ubuntu1~20.04.2 amd64 Xorg X server - core 
server

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.11.0-36.40~20.04.1-generic 5.11.22
  Uname: Linux 5.11.0-36-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.20
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Sep 28 11:55:47 2021
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) 
(prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Skylake GT2 [HD Graphics 520] 
[103c:804e]
  InstallationDate: Installed on 2021-09-22 (5 days ago)
  InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
  MachineType: HP HP Spectre x360 Convertible
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-36-generic 
root=UUID=c68313b0-c9ba-4714-abc0-dff5762a92b2 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  XorgConf:
   Section "Device"
      Identifier  "Intel Graphics"
      Driver      "intel"
      Option      "TearFree"    "true"
   EndSection
  dmi.bios.date: 12/27/2019
  dmi.bios.release: 15.54
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F.54
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 804E
  dmi.board.vendor: HP
  dmi.board.version: 33.24
  dmi.chassis.type: 31
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.ec.firmware.release: 33.24
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF.54:bd12/27/2019:br15.54:efr33.24:svnHP:pnHPSpectrex360Convertible:pvr:skuN7H72EA#AB8:rvnHP:rn804E:rvr33.24:cvnHP:ct31:cvrChassisVersion:
  dmi.product.family: 103C_5335KV G=N L=CON B=HP S=SPT
  dmi.product.name: HP Spectre x360 Convertible
  dmi.product.sku: N7H72EA#AB8
  dmi.sys.vendor: HP
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.107-1028
  version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3~20.04.2
  version.libgl1-mesa-glx: libgl1-mesa-glx 21.0.3-0ubuntu0.3~20.04.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1~20.04.2
  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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