Ha! I have been struggling today with this issue on exactly this type of
machine, although I'm using Hardy because I'm trying to setup UbuntuLite
(it's U-Lite now but I think the version I'm installing was called that)

I couldn't shut down X either - it would crash with the white issue
described above.

The VESA driver fixes my problem. I can quit X easily.

I hadn't thought of looking at Xorg.0.log - I did so and found the
refresh rate settings in it. Updating xorg.conf to use those allowed me
to get 1024x768 with the s3virge driver, but it had a shaky look to it -
perhaps it's an interlaced mode? The Vesa setup looked better. And again
with the s3virge driver I couldn't shut down X.

So I'm going back to the Vesa driver.

I'm attaching a zip file with files from the different scenarios, and
the results of lspci as requested. The "low-res" files were copied after
succeeding the first time with vesa so it could be that the DefaultDepth
setting is not how it was, but I hope that won't matter at this point.

I hope this helps, and will be happy if you can suggest any changes
which succeed in improving display quality on my machine.

** Attachment added: "490xcdt-x11.zip"
   http://launchpadlibrarian.net/22822403/490xcdt-x11.zip

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s3virge driver does not work correctly on Toshiba 490XCDT
https://bugs.launchpad.net/bugs/300767
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