Comment # 1 on bug 1020016 from Arjen de Korte

This bug is also present in Tumbleweed. The logs are spammed with 

dec 22 23:52:26 orthros.de-korte.org org.kde.KScreen[9249]: kscreen.xcb.helper:
RRNotify_OutputProperty (ignored)
dec 22 23:52:26 orthros.de-korte.org org.kde.KScreen[9249]: kscreen.xcb.helper:
        Output:  67
dec 22 23:52:26 orthros.de-korte.org org.kde.KScreen[9249]: kscreen.xcb.helper:
        Property:  Backlight
dec 22 23:52:26 orthros.de-korte.org org.kde.KScreen[9249]: kscreen.xcb.helper:
        State (newValue, Deleted):  0

Which results in about 2000 lines an hour in the logs with identical messages.
There may be a reason to log this, but it is insane to do so at this rate.