The screen power saving feature turns the monitor off then after a few seconds turns it back on then off and it is stuck in this loop. Nothing in the journal log. Running Tumbleweed, Fresh install, KDE, AMD Radeon 6650, Two monitors one DP the other HDMI. I have no issue with the HDMI monitor.
Could be caused by a broken ~/.config/powermanagementprofilesrc. Move it and restart KDE.