Same here - although I have KDE 5.6.x backports enabled (PPA) and launchpad is not supposed to track bugs against PPAs: http://www.kubuntu.org/news/plasma-5-6-4-available-in-16-04-backports/
There is an upstream Bug for this and meaning while marked as fixed: https://bugs.kde.org/show_bug.cgi?id=361688 Upstream is against kscreen 5.6.x while Xenial includes 5.5.5-0ubuntu1. However on my backported 5.6.5-0ubuntu1~ubuntu16.04~ppa1 I do see the same output as the thread author: Jul 24 12:00:38 thinktank org.kde.KScreen[2990]: kscreen.xcb.helper: RRNotify_OutputProperty (ignored) Jul 24 12:00:38 thinktank org.kde.KScreen[2990]: kscreen.xcb.helper: #011Output: 67 Jul 24 12:00:38 thinktank org.kde.KScreen[2990]: kscreen.xcb.helper: #011Property: Backlight Jul 24 12:00:38 thinktank org.kde.KScreen[2990]: kscreen.xcb.helper: #011State (newValue, Deleted): 0 Therefore it's not unlikely that the upstream fix fixes this Xenial Xerus bug as well. ** Bug watch added: KDE Bug Tracking System #361688 https://bugs.kde.org/show_bug.cgi?id=361688 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1579735 Title: kscreen spams my systemlog To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kscreen/+bug/1579735/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs