My machine locks (used with S3 VGA board)?
It is possible you have a problem with memory region overlap specific to S3. There is some info and a patch to the so-called S3 problem in the 3Dfx web site, but these apply to Windows only. To my understanding, the cause of the problem is that some S3 boards (older revisions of Diamond Stealth S3 968) reserve more memory space than actually used, thus the Voodoo Graphics ™ has to be mapped to a different location. However, this has not been reported as a problem with Linux, and might be Windows-specific.