GUI does not refresh when needed

[Jan W]

Yesterday I updated to Kubuntu 19.10. Since then, I'm having graphical issues. It looks as if the screen is not refreshed when needed. Examples:
- clicking a link in a browser
- typing commands in Konsole
- typing this bug report

When I force a "big" screen update, for instance by alt-tabbing (usually, pressing only alt is enough) the screen is refreshed.
When a "freeze" happens, the mouse cursor can still be moved.

I have an HP laptop using the Intel i915 driver. However, there is also an Nvidia gpu on board, which might muddy the water a bit. However, the nvidia gpu should be switched off (prime-select query returns intel). There are no options set for the i915 module.

Additionally, it seems that the issue doe not occur on a fresh boot, only after a sleep or hibernate.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: xserver-xorg-video-intel 2:2.99.917+git20190815-1
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
Uname: Linux 5.3.0-24-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CompositorRunning: None
CurrentDesktop: KDE
Date: Mon Dec 23 21:03:15 2019
DistUpgraded: 2019-12-21 22:30:51,931 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: eoan
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 5.3.0-24-generic, x86_64: installed
 nvidia, 440.44, 5.3.0-24-generic, x86_64: installed
 virtualbox, 6.0.14, 5.3.0-24-generic, x86_64: installed
 wireguard, 0.0.20191219, 5.3.0-24-generic, x86_64: installed
 zfs, 0.8.1, 5.3.0-24-generic, x86_64: installed
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:80a4]
InstallationDate: Installed on 2016-02-03 (1419 days ago)
InstallationMedia: Error: [Errno 13] Permission denied: '/var/log/installer/media-info'
MachineType: HP HP Pavilion Notebook
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-24-generic root=UUID=43cbb8c2-c0ce-40e2-a795-3a506e63d450 ro resume=UUID=321acbbf-9a6a-4825-8f47-a89d56536272 quiet splash pci=noaer pcie_port_pm=off nogpumanager nouveau.runpm=0 nouveau.blacklist=1 crashkernel=512M-:192M
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to eoan on 2019-12-21 (1 days ago)
dmi.bios.date: 10/13/2017
dmi.bios.vendor: Insyde
dmi.bios.version: F.85
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 80A4
dmi.board.vendor: HP
dmi.board.version: 91.1E
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.85:bd10/13/2017:svnHP:pnHPPavilionNotebook:pvrType1ProductConfigId:rvnHP:rn80A4:rvr91.1E:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV X=Null
dmi.product.name: HP Pavilion Notebook
dmi.product.sku: P4A01EA#ABH
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP
version.compiz: compiz N/A
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 1:2.10.6-1
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Sun Dec 22 20:16:54 2019
xserver.configfile: default
xserver.errors:
 libinput: SynPS/2 Synaptics TouchPad: Failed to create a device for /dev/input/mouse1
 PreInit returned 2 for "SynPS/2 Synaptics TouchPad"
 Failed to open authorization file "/var/run/sddm/{c77f7939-c416-47bb-80e1-c72f4be5b355}": No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 22596
 vendor SDC
xserver.version: 2:1.20.5+git20191008-0ubuntu1

[Jan W (ubuntu-kiekerjan)]

I noticed that the compositor backend renderer was set to OpenGL3.1. Setting is to OpenGL2 seems to solve the issue for now. Will test some more and come back to update.