[ubuntu] No screensaver when running on battery

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http://ubuntuforums.org – I just installed 9.10 I've noticed a small problem. The screensaver works fine when my laptop is running on AC power, but when it runs on battery power, the screensaver doesn't appear when locking the screen or waiting for it to activate. The screen does fade to black, and locks, but no screensaver...just a black screen. and how do i set the screen saver to be a single image (Hardware)