https://bugs.kde.org/show_bug.cgi?id=477152

            Bug ID: 477152
           Summary: Other monitor (via other input) dims while not
                    actively connected in a multi system multi monitor
                    set-up.
    Classification: Plasma
           Product: Powerdevil
           Version: 5.27.9
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: plasma-b...@kde.org
          Reporter: bclep...@gmail.com
                CC: m...@ratijas.tk, natalie_clar...@yahoo.de
  Target Milestone: ---

SUMMARY
Other monitor (active via other input) dims while not actively connected in a
multi system multi monitor set-up.

System is not being used for a while and dims monitor 1.
As a result monitor 2 dims as well (even though it is not showing/connected to
said system - but displaying another input).

STEPS TO REPRODUCE
Monitor 1 connected via DVI-D to 'desktop'.
Monitor 1 has no other inputs connected.

Monitor 2 connected via VGA to 'desktop'.
Monitor 2 connected via DisplayPort to docking station.

Monitor 1 is displaying DVI-D (so 'desktop').
Monitor 2 is displaying DisplayPort (so docking station).

Docking station is connected to a laptop.

Now wait until screen dims.

OBSERVED RESULT
'desktop' dims monitor 1 after not being used for a while (correct).
Monitor 2 dims as well (even though it is not showing/connected to desktop)
(unexpected).

Waking up monitor 1 (by e.g. mouse activity on 'desktop') also wakes up (i.e.
undims) monitor 2.

EXPECTED RESULT
Monitor 1 and monitor 2 are dimmed by their respective connected inputs (they
listen to the device they are connected to).

SOFTWARE/OS VERSIONS
    Operating System: Arch Linux 
    KDE Plasma Version: 5.27.9
    KDE Frameworks Version: 5.112.0
    Qt Version: 5.15.11
    Kernel Version: 6.6.1-arch1-1 (64-bit)
    Graphics Platform: X11
    Processors: 4 × Intel® Core™ i5-4590 CPU @ 3.30GHz
    Memory: 15,5 GiB of RAM
    Graphics Processor: Mesa Intel® HD Graphics 4600
    Manufacturer: Gigabyte Technology Co., Ltd.
    Product Name: B85M-HD3

ADDITIONAL INFORMATION
* 2 monitors (2x Dell P2314H)
  Energy Smart is off, DDC/CI disabled, LCD conditioning enabled (on both)
* Dell docking station D6000 USB-C
* System (name 'desktop')

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