I am running Precise beta 2 on a Dell Latitude E6410 with nVidia graphics.
I have set up the power management to turn the screen off after 10 mins of inactivity. Instead of it turning off, it simply goes blank (it's black, but the screen is still on). I'm not sure why this is happening.
xset -q shows:
Screen Saver: prefer blanking: yes allow exposures: yes timeout: 0 cycle: 0 Colors: default colormap: 0x20 BlackPixel: 0 WhitePixel: 16777215 Font Path: /usr/share/fonts/X11/misc,/usr/share/fonts/X11/Type1,built-ins DPMS (Energy Star): Standby: 0 Suspend: 0 Off: 0 DPMS is Enabled Monitor is On
I do not have a screensaver set up (in fact I don't even have the option under System Settings).