[Powerdevil] [Bug 360537] New: Keyboard Backlight endless loop when changed, only inside plasma session

[Fuchs via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=360537

            Bug ID: 360537
           Summary: Keyboard Backlight endless loop when changed, only
                    inside plasma session
           Product: Powerdevil
           Version: 5.5.95
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: plasma-devel at kde.org
          Reporter: develop at fuchsnet.ch

I have a thinkpad T430 which recently gained a better keyboard backlight
driver. 
It works in a VT both with the keyboard shortcut (FN+Space) or via dbus,
however, it breaks when inside a Plasma 5 session, as there is an endless loop
of the backlight cycling between the 3 states. 

qdbus --system org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight
org.freedesktop.UPower.KbdBacklight.GetBrightness   
0

qdbus --system org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight
org.freedesktop.UPower.KbdBacklight.GetMaxBrightness
2


Reproducible: Always

Steps to Reproduce:
0. Have a Thinkpad T430  (other models might be affected too, I don't have any)
1. Be in a Plasma 5 session
2. Change the Keyboard backlight, either via keyboard, via dbus or via the
battery plasmoid

Actual Results:  
Brightness endlessly cycles through possible states

Expected Results:  
Brightness is set correctly, as it is when switching to a VT

Plasma is 5.6 Beta, Qt is 5.5.1,  Kernel is 4.5 

Any information on how I could debug and solve this is appreciated.

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