Jessie with Xfce, and latest updates. Sometime last week I noticed that the screen has stopped blanking/turning off when I'm away from the computer. I come home from work and I can see the glow of the screen before I even enter the house. The first few times I figured the cats must have bumped the mouse or desk.
I've checked the settings in Powermanager, and did a little research with Google....... apparently Powermanager (as of Xfce 4.8 ) uses DPMS, but I really don't know where to go from here.
I haven't made any major changes........I've uninstalled Midori, and the installed the most recent updates as they've been made available. I use Virtualbox for experimenting, so that I don't mess things up.
I have MX-16 running on a vm, and it blanks it's virtual screen, but I still have the mouse cursor and dock showing brightly since they're part of the Jessie host, and the screen isn't really off as it's still glowing even if it's black.