FYI, I was able to undo the damage. It looks like a bad refresh rate was set. See https://askubuntu.com/questions/1313967/input-signal-out-of-range-after-logging-in-kde/1314034#1314034
FYI, I was able to undo the damage. It looks like a bad refresh rate was set. See https:/ /askubuntu. com/questions/ 1313967/ input-signal- out-of- range-after- logging- in-kde/ 1314034# 1314034