Hola,
This is just a hunch but I'm wondering if this could be a previously
undetected problem in the XFree86 memory manager. I want you people who can
reproduce the problem to try the above patch and tell me if it works. I
unfortunately no longer have access to an i810 or i815 (or i830 or i845 for
that matter.) So I can't test this to see if it works. If it does there is
a problem with the memory manager using the leftover bit of memory on the
side of the screen. Its probably very rare to hit the path and probably
just a small calculation thats off somewhere. If this patch works it gives
you a good data point at any rate, one thing which is not causing the
problem.
You might also try building the i810 driver with the #define XF86DRI not
defined because that will make the pitch and the width always be the same.
That will give you an additional data point to help you track down the
problem.-Jeff
i810.diff
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