This is a video ram bandwidth issue.  If you have a old or very low
end card and are trying to run a very high resolution (for that class of
card), it's normal.  If not then it's a driver bug of some sort.

                        Mark.

On Tue, 21 Sep 2004, davidjpenton wrote:

> Is it normal for X to generate a lot of visual noise on the screen when,
> e.g., you drag a vertical scroll bar?  My system shows tons of "sparks"
> to the right of a window if you drag a scroll bar, and in some other cases.
>
> - Dave -
>
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