https://bugs.kde.org/show_bug.cgi?id=406703

            Bug ID: 406703
           Summary: VSync setting does not work after reboot
           Product: kwin
           Version: 5.12.7
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: compositing
          Assignee: kwin-bugs-n...@kde.org
          Reporter: rybak....@gmail.com
  Target Milestone: ---

SUMMARY
"Full screen repaints" is not honored after reboot.

STEPS TO REPRODUCE
1. Open "System Settings > Display and Monitor > Compositor"
2. Set "Tearing prevention" to "Full screen repaints"
3. Reboot the PC.

OBSERVED RESULT
Windows visibly tear.

EXPECTED RESULT
"Full screen repaints" prevents tearing.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 18.04
(available in About System)
KDE Plasma Version: 5.12.7
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5

ADDITIONAL INFORMATION
Workaround: go through steps 1-2 again, and tearing stops.

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