https://bugs.kde.org/show_bug.cgi?id=479065

            Bug ID: 479065
           Summary: Brightness & Color System tray widget's Brightness
                    slider does not effect brightness of external monitor
    Classification: Plasma
           Product: plasmashell
           Version: 5.91.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Keywords: qt6
          Severity: normal
          Priority: NOR
         Component: Brightness Control
          Assignee: plasma-b...@kde.org
          Reporter: dougsha...@protonmail.com
                CC: natalie_clar...@yahoo.de
  Target Milestone: 1.0

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug
symbols.
See
https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1. Start Plasma with an external monitor attached (set to redirect output to
external monitor)
2. Open "Brightness & Color" System Tray Widget
3. Slide "Brightness" slider back and forth

OBSERVED RESULT
No changes in brightness

EXPECTED RESULT
Brightness should change with slider

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: KDE Neon Unstable
(available in About System)
KDE Plasma Version: 5.91.90
KDE Frameworks Version: 5.248.0
Qt Version: 6.6.1

ADDITIONAL INFORMATION

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