Fedora 27 Screen Saver
Just back from Oracle OpenWorld and somebody desperately wants to know how to disable the 5 minute default screen saver setting in the KDE environment. OK, you navigate to the Fedora “f” in the lower left hand corner and choose System Settings, like:
In the System Setting menu page, select Desktop Behavior:
In the Desktop Behavior dialog, select Screen Locking. Change the default to something large like 90 for 1 and half hours.
As always, I hope that solves your problem.