To complete my previous comment #2, I got an other case when I wait gnome to 
lock the screen:
- wait until the monitor is going to sleep
- wait some extra time that gnome-screensaver lock the session
- move the mouse
- wait that the monitor display an image
=> See that the image is the same that before the monitor went to sleep. The 
cursor can move but the entire desktop looks like a wallpaper
- go to first console, log in
- kill -9 `pidof compiz`
- go to X console
- see gnome lock screen being redrawn
=> The desktop can be use normally (after unlocking gnome session)

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https://bugs.launchpad.net/bugs/758214

Title:
  Screen does not refresh

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