Screen flicker, sections going dark, icons and filenames vanishing, flickering or looking jumbled up

[Rudi van Vuuren]

Started about 2 weeks ago, tried reinstalling Ubuntu20lts as fix yet issue persists.
I can't use terminal because whatever I type, after the third letter things vanish, or become jumbled and impossible to recognise.
Attempted updating intel drivers but wasn't successful, I'm not the best at this sort of thing.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Mon May 10 09:22:33 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:220c]
InstallationDate: Installed on 2021-05-09 (0 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
MachineType: LENOVO 20B7S0XX0L
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-50-generic root=UUID=ba39f6c6-e11e-4a3c-abb7-d8d45b02a4a6 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/21/2014
dmi.bios.release: 2.22
dmi.bios.vendor: LENOVO
dmi.bios.version: GJET72WW (2.22 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20B7S0XX0L
dmi.board.vendor: LENOVO
dmi.board.version: 0B98401 PRO
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.ec.firmware.release: 1.9
dmi.modalias: dmi:bvnLENOVO:bvrGJET72WW(2.22):bd02/21/2014:br2.22:efr1.9:svnLENOVO:pn20B7S0XX0L:pvrThinkPadT440:rvnLENOVO:rn20B7S0XX0L:rvr0B98401PRO:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.family: ThinkPad T440
dmi.product.name: 20B7S0XX0L
dmi.product.sku: LENOVO_MT_20B7_BU_Think_FM_ThinkPad T440
dmi.product.version: ThinkPad T440
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.2
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

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1924624, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.