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2. using an old working configuration from dapper (the most recent version of ubuntu that's known to work on this machine) which uses i810.
same result as with the empty configuration
(see Xorg.0.log.dapper for a log of the working configuration in ubuntu 6.06)
3. using the old configuration but with "vesa" instead of "i810"
I get the same distorted image but now it stays and additionally the whole screen is continously filled with an ever growing blur.