PuTTY SSH RetroPie
Another datapoint, if its useful. I regularly shutdown via ssh, but I run ssh from the command line (not via Putty).
The following shuts down my Pi and powers off (HDMI out becomes disabled, but always on Power LED stays on). Note: this is on Raspbian, and I ran uname to show you my version. The commands below were run remotely from my Macbook.
# ssh pi@raspberrypi -t uname -a Linux raspberrypi 3.18.7-v7+ #755 SMP PREEMPT Thu Feb 12 17:20:48 GMT 2015 armv7l GNU/Linux Connection to raspberrypi closed. # ssh pi@raspberrypi -t sudo shutdown -h -P now Broadcast message from root@raspberrypi (pts/0) (Fri Sep 11 12:): The system is going down for system halt NOW! Connection to raspberrypi closed.