https://bugs.kde.org/show_bug.cgi?id=361688

--- Comment #15 from Bruno Friedmann <br...@ioda-net.ch> ---
I can just concur to that : Here's a simple backlight event

in system journal 

Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper: RRNotify_OutputProperty (ignored)
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Output:  547
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     Property:  Backlight
Jan 05 19:39:21 qt-kt.labaroche.ioda.net org.kde.KScreen[2351]:
kscreen.xcb.helper:     State (newValue, Deleted):  0

and the same is also registered in ~/.local/share/kscreen/kscreen.log

05.01.2017 19:39:21.028 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.028 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.029 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.029 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.029 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.029 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.029 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.029 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.064 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.064 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.064 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.064 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.064 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.065 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.065 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.065 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.080 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.080 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.080 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.080 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.081 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.081 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.081 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.081 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.096 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.097 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.097 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.097 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.097 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.097 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.097 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.097 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.112 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.112 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.112 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.112 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.113 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.113 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.113 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.113 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.128 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.128 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.128 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.128 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.128 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.128 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.128 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.128 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.143 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.143 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.144 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.144 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.144 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.144 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.144 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.144 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.159 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.159 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.159 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.159 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.159 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.159 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.159 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.159 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.176 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.176 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.176 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.176 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.177 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.177 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.177 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.177 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.192 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.192 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.192 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.192 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.193 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.193 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.193 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.193 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.208 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.208 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.208 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.208 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.208 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.208 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.208 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.208 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.224 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.224 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.224 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.224 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.224 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.225 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.225 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.225 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.239 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.239 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.239 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.239 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.240 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.240 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.240 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.240 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.256 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.256 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.257 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.257 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.257 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.257 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.257 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.257 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.272 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.272 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.272 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.272 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.272 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.272 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.272 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.272 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.287 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.288 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.288 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.288 ; xcb.helper ;  :       State (newValue, Deleted):  0
05.01.2017 19:39:21.288 ; xcb.helper ;  : RRNotify_OutputProperty (ignored)
05.01.2017 19:39:21.288 ; xcb.helper ;  :       Output:  547
05.01.2017 19:39:21.288 ; xcb.helper ;  :       Property:  Backlight
05.01.2017 19:39:21.288 ; xcb.helper ;  :       State (newValue, Deleted):  0

I've tried to use all the trick to shutup all of this noise (Until I want to
check and debug something, all of those are just killing my M2 ssd and use i/o
and place for nothing)

I've 
QT_LOGGING_RULES=kscreen.*=false
and all off in kdebugsettings.

@Sebastian it would be reasonable to have the lower impact on user system by
default, then having flags and bolts and nuts activable when debug is needed.

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