Debian testing on a "Lenovo Ideapad Laptop" locks-down by issuing "Hibernate" or "Suspend" command, either via GUI (Gnome, Cinnamon, Mate, ...), or via CLI:
echo mem > /sys/power/state
To hibernate:
echo platform > /sys/power/disk
echo disk > /sys/power/state
All packages on system are up to date.
Here is "uname -a" output:
Linux cto-laptop 4.3.0-1-amd64 #1 SMP Debian 4.3.3-7 (2016-01-19) x86_64 GNU/Linux