[buk]

And the rest of the message is: "Is there another framebuffer device?"

That happens under:
SuSE Linux 8.1 fully updated
Processor AMD Athlon 1.7 GHz
512 MB of RAM
Graphic card: SiS 630

When:
Running any sort of application that needs 3D acceleration.

That does not occur with Red Hat 8.0 with the same hardware specified.

I appreciate any comment or help.

[chrispope]

Have you installed 3d acceleration? If not then do so if you can.
Also try using mem=512m at the boot prompt before linux loads, linux might be getting mixed signals from the bios about the ram so this should clear that if it is a problem.