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Strange artifacts on cheap card: my fault??

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Hi, My openGL scene gets rendered in a different way on my notebook. There are strange artifacts appearing sometimes in the border of the scene : http://www.geocities.com/liebeskleineskerlchen/artifacts.jpg It seems that some triangles are culled by the graphic card (I render QUADS, so it can''t be my fault, right?) I can''t remember the name of the graphic chip, but I read that it''s one of the worst you could by 2 years ago Is there a workaround to avoid these artifacts? Thanks

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what are the artifacts?

http://uk.geocities.com/sloppyturds/kea/kea.html
http://uk.geocities.com/sloppyturds/gotterdammerung.html

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I don''t know if artifact is the right term, but it seems that parts of some rendered quads are simply culled (but they shouldn''t). Here a screen shot of the scene with my notebook:

http://www.geocities.com/liebeskleineskerlchen/bad.jpg

Some triangles in the upper right corner are simply culled away! If I turn backface culling off on that computer, or if I rotate the camera slightly, the scene is rendered correctly.

Here a screenshot of the scene how it should be rendered (and how it is rendered on a different computer):

http://www.geocities.com/liebeskleineskerlchen/good.jpg

The graphic chip on my notebook is a ''SiS 630/730''...

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that looks to be a ''major'' error in the graphics cards drivers email the chips makers with a sample application.

http://uk.geocities.com/sloppyturds/kea/kea.html
http://uk.geocities.com/sloppyturds/gotterdammerung.html

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