I already did it some time ago, with no result.
I did it again now, but cat /proc/cmdline report the same result as before:

camp@camp-medion:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.13.0-41-generic
root=UUID=cbfc0023-baf3-4a11-b0aa-6dadbd0f60f7 ro quiet splash
pci=noaer vt.handoff=7


On 16/06/2023, Daniel van Vugt <email address hidden> wrote:
> Thanks for the bug report. Please try adding the following kernel
> parameter:
>
>   i915.enable_psr=0
>
> to /etc/default/grub under GRUB_CMDLINE_LINUX_DEFAULT, then run:
>
>   sudo update-grub
>
> and reboot. Finally check to see that it's being used:
>
>   cat /proc/cmdline
>
> ** Package changed: xorg (Ubuntu) => linux-hwe-5.13 (Ubuntu)
>
> ** Changed in: linux-hwe-5.13 (Ubuntu)
>        Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/2023927
>
> Title:
>   Screen flickering whe update images
>
> Status in linux-hwe-5.13 package in Ubuntu:
>   Incomplete
>
> Bug description:
>   Often, when there are small changes in image displayed, an horizontal
> flickering is observed. This happen for example on a mouse right button
> menu, or when a hyperlink description appears on the screen bottom when
> mouse pointer cross some field on a webpage, also when favorites menu
> appear.
>   The flickering usually disappear in a few moments, sometimes (usually when
> a few pixels are updating) it can last for seconds.
>   This flickering is caused by a late updating of some horizontal lines, so
> for awhile a few lines of previous image coexist with a majority of new
> ones
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 20.04
>   Package: xorg 1:7.7+19ubuntu14
>   ProcVersionSignature: Ubuntu 5.13.0-41.46~20.04.1-generic 5.13.19
>   Uname: Linux 5.13.0-41-generic x86_64
>   ApportVersion: 2.20.11-0ubuntu27.23
>   Architecture: amd64
>   BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
>   CasperMD5CheckResult: skip
>   CompositorRunning: None
>   CurrentDesktop: ubuntu:GNOME
>   Date: Wed Jun 14 22:44:12 2023
>   DistUpgraded: Fresh install
>   DistroCodename: focal
>   DistroVariant: ubuntu
>   DkmsStatus:
>    virtualbox, 6.1.32, 5.13.0-40-generic, x86_64: installed
>    virtualbox, 6.1.32, 5.13.0-41-generic, x86_64: installed
>    virtualbox, 6.1.32, 5.4.0-126-generic, x86_64: installed
>   ExtraDebuggingInterest: Yes, including running git bisection searches
>   GraphicsCard:
>    Intel Corporation Device [8086:9a49] (rev 01) (prog-if 00 [VGA
> controller])
>      Subsystem: Device [1e39:a025]
>   InstallationDate: Installed on 2022-01-01 (529 days ago)
>   InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64
> (20210819)
>   Lsusb: Error: command ['lsusb'] failed with exit code 127: lsusb: symbol
> lookup error: lsusb: undefined symbol: libusb_error_name
>   Lsusb-t: Error: command ['lsusb', '-t'] failed with exit code 127: lsusb:
> symbol lookup error: lsusb: undefined symbol: libusb_error_name
>   Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 127: lsusb:
> symbol lookup error: lsusb: undefined symbol: libusb_error_name
>   MachineType: MEDION S15449
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-41-generic
> root=UUID=cbfc0023-baf3-4a11-b0aa-6dadbd0f60f7 ro quiet splash pci=noaer
> vt.handoff=7
>   SourcePackage: xorg
>   Symptom: display
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 04/09/2021
>   dmi.bios.release: 5.19
>   dmi.bios.vendor: American Megatrends International, LLC.
>   dmi.bios.version: 212
>   dmi.board.asset.tag: Default string
>   dmi.board.name: M15T
>   dmi.board.vendor: MEDION
>   dmi.board.version: Default string
>   dmi.chassis.asset.tag: Default string
>   dmi.chassis.type: 10
>   dmi.chassis.vendor: MEDION
>   dmi.chassis.version: Default string
>   dmi.modalias:
> dmi:bvnAmericanMegatrendsInternational,LLC.:bvr212:bd04/09/2021:br5.19:svnMEDION:pnS15449:pvrDefaultstring:rvnMEDION:rnM15T:rvrDefaultstring:cvnMEDION:ct10:cvrDefaultstring:skuML-23000830031014:
>   dmi.product.family: Akoya
>   dmi.product.name: S15449
>   dmi.product.sku: ML-230008 30031014
>   dmi.product.version: Default string
>   dmi.sys.vendor: MEDION
>   version.compiz: compiz N/A
>   version.libdrm2: libdrm2 2.4.107-8ubuntu1~20.04.2
>   version.libgl1-mesa-dri: libgl1-mesa-dri 21.2.6-0ubuntu0.1~20.04.2
>   version.libgl1-mesa-glx: libgl1-mesa-glx N/A
>   version.xserver-xorg-core: xserver-xorg-core 2:1.20.13-1ubuntu1~20.04.2
>   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 N/A
>   version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.13/+bug/2023927/+subscriptions
>
>