Hello,
my monitor settings are: blank screen in 5m, energy saving in 15m, shutoff in 30m.
Now after 5m my monitor goes black as expected but 3 seconds later energy saving (or shutoff i don’t know, just that monitor LED turns yellow and it takes more time to reactivate) kicks in as well.
I should note that this behavior is new, it worked before, but one day i decided to try out the xfce4-screensaver package, then decided i don’t really need it and removed it).
After the described behaviour startet. I checked and doublechecked my energy settings nothing changed.