• HOWTO: Replace gnome-screensaver with xscreensaver - Ubuntu Forums
  Note: I have another guide for adjusting screensaver settings in Dapper without replacing gnome-screensaver. I prefer the method described in that guide to this one, but your mileage may vary. Both have their pros and cons so make sure you check out both before applying the instructions. Problem: Dapper ships with gnome-screensaver instead of xscreensaver, which gives the user no option to set individual screensaver settings.
  HOWTO: Replace gnome-screensaver with xscreensaver Faqs, Howto, Tips & Tricks
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  in Computing > Linux > Howto with adjusting applying dapper gnome-screensaver guide howto instructions linux problem replacing screensaver tutorial ubuntu xscreensaver
  Note: Details: In Dapper display power management functions were decoupled from the screensaver with the introduction of Gnome Power Manager. xscreensaver provides both functions, thus became partially redundant. Refer to the gnome-screensaver FAQ, the upstream bugzilla discussion and the Launchpad discus ...moresion for more details if interested.

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