https://bugs.kde.org/show_bug.cgi?id=470106

            Bug ID: 470106
           Summary: brightness-control slider shows different percentage
                    than OSD
    Classification: Plasma
           Product: plasmashell
           Version: 5.27.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: plasma-b...@kde.org
          Reporter: slartibar...@gmail.com
                CC: k...@davidedmundson.co.uk
  Target Milestone: 1.0

Laptop screen and connected 4K (DP) monitor

Problem:
"Battery and Brightness" in systemtray shows a different brightness-percentage
than set on laptop screen.
Modifying the brightness-slider then 'suddenly jumps' to a way too dark setting
I need to use the hardware-keys (Fn-*) to set the brightness up again to a
usable state.
Still, the brightness-slider is not in sync with the OSD (OSD ~65%,
brightness-slider ~45%)

This was working properly already but seems to be a regression?

Operating System: Fedora Linux 37
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
Kernel Version: 6.3.3-100.fc37.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7820HQ CPU @ 2.90GHz
Memory: 31,1 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 630
Manufacturer: LENOVO
System Version: ThinkPad T470p

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