This happens when I use fractional scaling. At 100%, my HP 840 G3 runs smooth and fast. With fractional scaling at 125%, there is the following: visual tears when moving videos while playing; Ubuntu operates slow with system apps and 3rd party apps; system hangs and crashes; and more.
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.0.0-32.34~18.04.2-generic 5.0.21
Uname: Linux 5.0.0-32-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 21 01:03:54 2019
DistUpgraded: Fresh install
DistroCodename: eoan
DistroVariant: ubuntu
ExtraDebuggingInterest: No
GraphicsCard:
Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company EliteBook 840 G3 [103c:8079]
InstallationDate: Installed on 2019-08-22 (90 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
MachineType: HP HP EliteBook 840 G3
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-32-generic root=UUID=63069e05-3459-49f5-9de1-e6594c7cce44 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/01/2016
dmi.bios.vendor: HP
dmi.bios.version: N75 Ver. 01.13
dmi.board.name: 8079
dmi.board.vendor: HP
dmi.board.version: KBC Version 85.74
dmi.chassis.asset.tag: 5CG7065GM1
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnHP:bvrN75Ver.01.13:bd11/01/2016:svnHP:pnHPEliteBook840G3:pvr:rvnHP:rn8079:rvrKBCVersion85.74:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI
dmi.product.name: HP EliteBook 840 G3
dmi.product.sku: V1H24UT#ABA
dmi.sys.vendor: HP
version.compiz: compiz 1:0.9.14.0+19.10.20190918-0ubuntu1
version.libdrm2: libdrm2 2.4.99-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 19.2.1-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
Please avoid reporting multiple issues in a single bug.
The tearing issue is bug 1846398 already so the remaining issues are "Ubuntu operates slow with system apps and 3rd party apps; system hangs and crashes; and more". Are you saying Ubuntu is only slow when you are using fractional scaling?