I'm having this screen-saver problem on Intrepid as well:

1) I turned it off while playing a game (Padman) because when the screen saver 
started the game would crash (why is the screen saver going on at all in this 
case? The computer is not idle!)
2) After re-enabling the screen-saver, it will not activate.
3) I set the time-out for 1 minute to test things...
4) At 30 seconds or so, the screen starts to dim. (In "Power Management" I have 
"Dim display when idle" enabled)
5) Then at 1 minute, the screen brightens back up and no screen-saver "occurs."

Now, something interesting happens:

6) Every time after this "failed" screen-saver activation, keyboard and
mouse clicks are unresponsive. (i can still move the pointer and high-
light things on the desktop ... just no click-events on menus and
applications appear to be working). But not entirely; I can CTRL-ALT-Fx
to switch to one of the TTYs and then come back to the desktop and
keyboard and mouse clicks work again.

Question: Will /var/log/message or dmesg show any debug or failure of
the screen-saver activation?

Hardware:
Dell M65 Laptop with Dual-core Intel and nVidia graphics

/Charlie

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[hardy] screensaver fails to start and screen fails to completely black out
https://bugs.launchpad.net/bugs/229144
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