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I am running 12.04 on three machines. On one of the machines I am running an Intel 82G33/G31 Express Integrated Graphics Controller as a display adapter. On this particular machine the grid of white dots overlaid on top of the wallpaper for the currently selected user is messed up big time.

Once I move the mouse, the graphics magically fix themselves. Then if I select a new user the grid of dots is messed up again until I move the mouse.

Once I log in the graphics seem to be running fine. Any ideas?

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This appears to be a bug, which you should report on launchpad. – RolandiXor May 2 '12 at 14:47

You can get rid of the white dots.

sudo xhost +SI:localuser:lightdm
sudo su lightdm -s /bin/bash
gsettings set com.canonical.unity-greeter draw-grid false

Got it from here.

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