Well, that's good news, isn't it? :-)
At present, I have, in /etc/acpi/handler.sh
button/lid)
xset dpms force off
;;
*)
logger "ACPI group/action undefined: $1 / $2"
;;
I'll replace with what you have (though xset dpms force off rather
than the echo command), and see if the problem goes away. Thanks!