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Whenever something updates the screen, I see little dots flashing randomly nearby -- for example, when something is animating in a dialog box then I see lots of little pixels (of random colour) pop up typically to the right of the dialog.
They're not permanent -- they just flash up for a fraction of a second and then disappear. But it's highly annoying.
It's doesn't seem to be the display manager's fault; a fresh install of X running just TWM still has the problem (though it's more noticeable in KDE or Gnome because they update the screen more). And it happens in both XFree86 and Xorg.
The video card is a Diamond Stealth 3D 2000; I'm not sure exactly how much RAM it has.
Some excerpts from my config (this is all pretty much autoconfigured, except for the "fifo_conservative", which I added because it seemed to help a little: