https://bugs.kde.org/show_bug.cgi?id=489643
--- Comment #6 from knoppm...@gmail.com --- I believe the root cause of this issue relates to power management. If I disable it, I don't have the issue if the system isn't used for a period of time. Of course with power management disabled, I have to manually lock the desktop (Why cannot the desktop lock automatically and independently of power management?). -- You are receiving this mail because: You are watching all bug changes.