Same basic problem, but found a potential shoddy workaround:
-Natty, Helios screensaver, 945GM/GMS/GME + 943/940GML Express IG Controller, 
EeePC 900HA Netbook...

When the screen locks up, I have used the VGA port to sometimes get the display 
back.
1. Plug-in a VGA cable (I have one hooked up to a TV anyhow)
2. Use the built-in (or pre-configure) hotkeys (for me Fn+F5) to cycle through 
the multiple monitor modes -wait a few secs each time

Hopefully something will reappear.  In my case I have had:
-parts of the screen reappear (enough to right click a launcher in, terminal 
etc.)
-parts of the screen come back with other parts reappearing when spawned (eg. 
click gnome menu, parts unfold clearing screen)

-the whole screen comes back

-both screens come back

If this doesn't work, try taking the VGA cord out and recycling through
the modes again. S-video/HDMI might work as well.

It might be worthwhile to write a refresh script you can get to with a
keyboard shortcut or alias you can put in a terminal.  That way you
won't even need visual output to get you started.

Still no solution.

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https://bugs.launchpad.net/bugs/762918

Title:
  Natty Screensaver freezes system after some period of inactivity

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