On some older chipsets, the driver may trigger an illegal instruction
just after probing for the ``scratchpad size''. If this is the case,
email to Annius.Groenink@cwi.nl with the output of
XF86_SVGA -probeonly -verbose
and this will be fixed.
There are limitations to the modeline values that can be specified.
Particularly, the difference between the first two horizontal
timings (e.g. 640 656, 1024 1048) must be at least 16 and at most 24.
The 4 colour server is slow due to the VGA banking mode used.
Moreover,
it does not work the way it is run by XF86Setup, which is probably
due to the timing limitations.