I have been seeing this recently, and apparently the problem was that gnome-power-manager was not running for some reason. Starting it manually apparently sets the power management/screensaver settings to the xserver (xset s off; xset -dpms in my case).
I have been seeing this recently, and apparently the problem was that gnome-power-manager was not running for some reason. Starting it manually apparently sets the power management/ screensaver settings to the xserver (xset s off; xset -dpms in my case).