Installing Red Hat Linux 6.1 + updates on a system whose motherboard has
an on-board SiS 5597/5598 video controller, the fonts in X are solid blocks
of colour. After much tweaking a working fix was found to be to add to
the /etc/X11/XF86Config file in the video card section:
Apparently this video hardware worked fine in XFree86-220.127.116.11 and got
broken since then...
*** This bug has been marked as a duplicate of 6970 ***