Commenting out or removing the final "/sbin/shutdown -h now "Power button pressed"" line in /etc/acpi/powerbtn.sh fixes things, such that the laptop does what KDE is set to.
Commenting out or removing the final "/sbin/shutdown -h now "Power button pressed"" line in /etc/acpi/ powerbtn. sh fixes things, such that the laptop does what KDE is set to.