If the lines are correct, you should be able to run "linetest":
http://www.xfree86.org/~mvojkovi/linetest.c
without artifacts. The zero-width lines are the hardware ones.
I just ran linetest both with the buggy XFree 4.3.0 version of s3_drv.o and with the fixed one provided by Thomas Winischhofer.
The result is like expected: With the buggy version, the zero-width lines do not work correctly and nice line patterns can be drawn. You can look at a screenshot at http://people.freenet.de/pei/s3_bug.gif. With the new version, it's ok (only 1 visible line). Lines with a higher width are fine in both versions.
Many thanks to Thomas!
Klaus
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