After upgrading to 13.04 from Xubuntu 12.10, my monitor no longer goes to sleep automatically. In Power Manager, On AC, Monitor, I have it set to put the display to sleep after 10 minutes off after 15, but the monitor stays on the whole time. However, I can manually put the monitor in sleep mode by running
xset dpms force off. Any ideas?
Edit: On further investigation, even if I use
xset dpms force off, the monitor switches back on after a 10-15 seconds, but the screensaver does not go off.