Despite what you may have heard form the XF86 people, the 3.3.5 version of
X (3DLabs) does NOT work with the Elsa Gloria-XL video card.
The last version of XFree86 that is known to work correctly with the
Gloria-XL is the 188.8.131.52 version.
You should note this on your hardware compatibility list.
*** This bug has been marked as a duplicate of 4994 ***