Screensaver should have power specific options (for A/C and battery)

When selecting a screensaver under "System > Preferences > Screensaver", you should be able to select a separate screensaver when a laptop is plugged-in (A/C) and when it is on battery.

There is an option under "System > Preferences > Screensaver > Power Management" for turning off the screen after a certain length of time, but the screensaver still plays underneath and therefore takes up the GPU (or CPU on emdedded systems). You can only set the screensaver time universally but not specific to the power settings. If you could set the screensaver to turn on after 5 minutes on A/C and never for battery, then this would be beneficial for the average Ubuntu user and their battery life.

Also, should the screensaver and power management dialogue not be concatenated into one, especially if they are so intertwined.