https://bugs.kde.org/show_bug.cgi?id=447702

            Bug ID: 447702
           Summary: kwin-5.23.4 results in white/gray screen when
                    compositing turned on
           Product: kwin
           Version: 5.23.4
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: compositing
          Assignee: kwin-bugs-n...@kde.org
          Reporter: dfloger...@gmail.com
  Target Milestone: ---

SUMMARY

Since upgrading to kwin-5.23.4 on Gentoo, logging in results in a white/gray
screen.  If I move the mouse around I can tell it changes shape when it passes
over windows from my saved session.  If I disable compositing with the keyboard
shortcut, I can see the desktop again.  This setup worked well with
kwin-5.22.5.

This seems independent of plasma, trying LXQT with kwin results in the same. 
This is an old 32bit Dell D820 laptop, with nvidia quadro nvs 110M.  I'm
running a 4.19 LTS kernel with nouveau.  The system is otherwise up to date
with the exception of the older kernel series.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: gentoo
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.88
Qt Version: 5.15.2+ (Gentoo packages)

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