I've been reported this on #687450 and corfirm this and other problem
related shotwell (see my bug).
A partially fixing is:
If you want to show off your photos in all of their glory, why not run a
slideshow of them?
* Watch a slideshow using the Image Viewer
* Watch a slideshow using the Shotwell Photo Manager
Setting a Slideshow as Your Screensaver
You can use a slideshow of your photos as you screensaver:
1. Press System → Preferences → Screensaver
2. Select the Folder Images
3. Phot present in Image folders will be displayed as your screensaver
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https://bugs.launchpad.net/bugs/723001
Title:
no screensaver capability
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