> Stuart,
>   This is a watermark issue. The watermark is the set of delays etc.
> that control the flow of data into and out of a FIFO that feeds the
> dac. Your FIFO is probably running out of data when memory bandwidth
> isn't available to fill the screen and blit at the same time.

Hmm. Especially considering that I'm running an i810 (*spit*), this
could very well be the issue. *starts browsing the Green Guide for
a new Matrox* :)

>  Your video mode is probably to blame. Either run at a lower refresh
> rate,

Eeeeeeeeeeew. 75 Hz (the current refresh rate), for me, is the bare
minimum for a reasonable display; I'd actually prefer to be playing
at 85 Hz. Anything less, and I can pick up on the flicker.

> or a smaller resolution.

That's even worse. :-) On a 19" screen, 1024x768 (the next resolution
down) isn't what I'd call fun. And to think that I've been intending
to bump the resolution *up*... :)

> Additionally there were some systems
> that had a incorrect bios setting in the MEMMODE register. This was
> fixed in XFree sometime recently but I don't recall when. If your
> system suffers from that issue upgrading to 4.2.0 may provide better
> results.

I'll look into that, then.

>  Additionally if you are using a non standard Modeline in XF86Config...
> don't do that.

It looks like I'm using the default modes, rather than a user-supplied
mode.

Thanks to all who responded.. food for thought.
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