[kde] [Bug 445041] New: KDE causing unusual UI flickering in UE5 EA

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=445041

            Bug ID: 445041
           Summary: KDE causing unusual UI flickering in UE5 EA
           Product: kde
           Version: unspecified
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: sethmb at protonmail.com
  Target Milestone: ---

SUMMARY

When using Unreal Engine 5, I experience an unusual flickering issue when
interacting with UI elements. This issue is most likely a problem with KDE, as
it doesn't seem to occur on Gnome.

I have attached a reference video of the problem.


STEPS TO REPRODUCE
1.  Download the source code for Unreal Engine 5 from GitHub (requires an Epic
Games account, with a signed agreement).
2.  Compile the source.
3.  Open the engine and create a new project, then open the project.
4. Perform similar steps to those shown in the video (navigate around the UI
for a few moments) to observe the issue.

OBSERVED RESULT

Unusual flickering and general graphical issues will interfere with the user
interface.

EXPECTED RESULT

The UI would render normally without any unexpected artifacts.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma:  Manjaro (Testing)
(available in About System)
KDE Plasma Version: 5.23.2
KDE Frameworks Version:  5.87.0
Qt Version: 5.15.2

Graphics Platform: X11
Graphics Processor: AMD DIMGREY_CAVEFISH

ADDITIONAL INFORMATION

As a pure guess, I suspect that the issue is being caused by KDE retaining some
information about the previous frame(s) for too long and rendering it over
newer frames.

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