https://bugs.kde.org/show_bug.cgi?id=506122

            Bug ID: 506122
           Summary: Brightness of unused screens is changed to 100% even
                    when configured to a different value
    Classification: Plasma
           Product: plasmashell
      Version First 6.3.5
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Power management & brightness
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: 1.0

SUMMARY
When having multiple monitors connected to the main machine (with
plasma/wayland) and some monitors are displaying stuff from other machines.
Plasma wants to set the briughtness of the connected monitors inactive in
plasma but used by other devices to 100% even when the given monitor is
configured to be at 30% brightnes.

STEPS TO REPRODUCE
1. Have 2 monitors, both connected to plasma machine and one to external
machine
2. Have only one monitor enabled is plasma settings, and have the other be used
by other machine
2. start the system / login

OBSERVED RESULT
Brightness of the plasma inactive monitor but used by other machine is set to
100%

EXPECTED RESULT
The brightness of NOT enabled monitor is left untouched.

SOFTWARE/OS VERSIONS
Operating System: Artix Linux 
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Graphics Platform: Wayland

ADDITIONAL INFORMATION
There is a possibly relevant bug: https://bugs.kde.org/show_bug.cgi?id=494497
I do not know if this is exactly same use case, so feel free to close this one
if they are the same.

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