LInes/Flickers occur in upper half of the screen.

Lines or flickers occur in upper half of the screen while playing videos(1080p).I think some frames are being dropped. Had the same problem with Ubuntu 18.04. I think this is some issue with Intel HD Graphics drivers in the system.Ready to do any follow up procedures.

Earlier when I used Ubuntu 16.04 there was no such problem.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: skip
CompositorRunning: None
Date: Mon Aug 3 16:24:16 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
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:81ec]
   Subsystem: Hewlett-Packard Company Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330 / M430 / Radeon 520 Mobile] [103c:81ec]
InstallationDate: Installed on 2020-07-31 (3 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 04f2:b56c Chicony Electronics Co., Ltd HP TrueVision HD
 Bus 001 Device 002: ID 0bda:b008 Realtek Semiconductor Corp. Bluetooth Radio
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP Notebook
ProcEnviron:
 LANGUAGE=en_IN:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic root=UUID=d981cf87-c80a-4e9c-b4a1-e2c2073a35ed ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/01/2016
dmi.bios.vendor: Insyde
dmi.bios.version: F.14
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 81EC
dmi.board.vendor: HP
dmi.board.version: 61.30
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.14:bd08/01/2016:svnHP:pnHPNotebook:pvrType1ProductConfigId:rvnHP:rn81EC:rvr61.30:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP
dmi.product.name: HP Notebook
dmi.product.sku: Z1D92PA#ACJ
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.2
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