Public bug reported:

When using the KDE desktop for a certain amount of time (seems random),
the window decoration in the top-left corner starts for flicker for the
active application.  The flickering remains when the application loses
focus, so more and more decorations will flicker.

The flickering occurs for both OpenGL renderers, but not with XRender.
I know no way of making the flickering stop, except for rebooting or
switching to XRender and back.

These issues started with Kubuntu 18.04, if I remember correctly.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: xorg 1:7.7+19ubuntu8
ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CompizPlugins: No value set for 
CompositorRunning: None
CurrentDesktop: KDE
Date: Tue Jan 29 16:51:51 2019
DistUpgraded: 2019-01-09 21:53:41,840 DEBUG Running PostInstallScript: 
DistroCodename: cosmic
DistroVariant: ubuntu
DkmsStatus: virtualbox, 5.2.18, 4.18.0-13-generic, x86_64: installed
ExtraDebuggingInterest: No
 Intel Corporation HD Graphics 530 [8086:1912] (rev 06) (prog-if 00 [VGA 
   Subsystem: ASUSTeK Computer Inc. HD Graphics 530 [1043:8694]
InstallationDate: Installed on 2016-08-24 (887 days ago)
InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-13-generic 
root=UUID=eb8f662d-aaeb-4bdd-8750-00ed26e8a5ce ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to cosmic on 2019-01-09 (19 days ago) 08/29/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2001
dmi.board.asset.tag: Default string Z170-A
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi:bvnAmericanMegatrendsInc.:bvr2001:bd08/29/2016:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ170-A:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring: To be filled by O.E.M. System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.95-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.6-1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3

** Affects: kwin (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug cosmic kubuntu resolution ubuntu

** Package changed: xorg (Ubuntu) => kwin (Ubuntu)

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  Window decorations flicker with OpenGL renderers

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