I was checking my synaptic but I don't have mate-power-manager.AstroGeek wrote: Install either the mate power manager (package mate-power-manager), which may or may not work for you--I've been have problems with some dependencies--or the xfce4 power manager (package xfce4-power-manager) which is compatable with MATE. From the power manager options you can set up the conditions under which your computer goes to sleep or into hibernation.
At this point I demoted LM12 from (hoping for it to become my main OS). I find myself spending more time trying to make LM12 work like LM9 but unfortunately it required more time and skills than what I have.
So, I'm going with other OS for now.