Comment 0 for bug 1958538

As soon I set the screen resolution to non native (4k laptop display) the screen begins to flicker and horizontal/vertical lines appear. Interestingly this happens only to the internal screen, external monitors work fine.

Also during boot (supposedly when the display driver is loaded) severer tearing is visible for brief moment.

An issue with the screen itself can be ruled out since there are no issues when running ubuntu 20.04.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: xorg 1:7.7+22ubuntu2
ProcVersionSignature: Ubuntu 5.13.0-27.29-generic 5.13.19
Uname: Linux 5.13.0-27-generic x86_64
ApportVersion: 2.20.11-0ubuntu71
Architecture: amd64
CasperMD5CheckResult: pass
CompositorRunning: None
Date: Thu Jan 20 15:14:11 2022
DistUpgraded: Fresh install
DistroCodename: impish
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [1002:1638] (rev d1) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Cezanne [17aa:5094]
InstallationDate: Installed on 2022-01-03 (16 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
MachineType: LENOVO 20XLS0CJ00
ProcEnviron:
 LANGUAGE=de_CH:de
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=de_CH.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.13.0-27-generic root=UUID=9b2ef1f6-51f0-4f81-a1cd-0e7a073ff58e ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/03/2021
dmi.bios.release: 1.11
dmi.bios.vendor: LENOVO
dmi.bios.version: R1MET41W (1.11 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20XLS0CJ00
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.11
dmi.modalias: dmi:bvnLENOVO:bvrR1MET41W(1.11):bd09/03/2021:br1.11:efr1.11:svnLENOVO:pn20XLS0CJ00:pvrThinkPadT14Gen2a:rvnLENOVO:rn20XLS0CJ00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20XL_BU_Think_FM_ThinkPadT14Gen2a:
dmi.product.family: ThinkPad T14 Gen 2a
dmi.product.name: 20XLS0CJ00
dmi.product.sku: LENOVO_MT_20XL_BU_Think_FM_ThinkPad T14 Gen 2a
dmi.product.version: ThinkPad T14 Gen 2a
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.107-8ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 21.2.2-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.13-1ubuntu1.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200714-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-1build1