Funny. I have not had an issue with GhostBSD suspending on an HP laptop while running KDE Plasma.
I punched in sysctl-a | grep S3 just to see what would happen. Here's what I got:
sysctl -a | grep S3
hw.acpi.suspend_state: S3
hw.acpi.sleep_button_state: S3
hw.acpi.supported_sleep_state: S3 S4 S5
Interesting, to me at least. I wonder what the S4 and S5 states mean?