History: I recently upgraded to XFree86-3.3.5 on my RH6.0 AMD K6-II Linux box using the rpms from the ftp://ftp.redhat.com/updates site. My motherboard is a TX Pro-II with on board SiS 5597/5598 video and CMI8330 sound. When I upgraded the XF86_SVGA server I found it to be broken and all my X windows text disappeared, it appeared as coloured solid blocks and the mouse pointer would regularly turn into a solid 32x32 block. Fix: Not wanting to retrograde back to XFree86-3.3.3.1, which had previously worked, I installed the SuSE XFCom_SiS server from http://www.suse.de/XSuSE/XSuSE_E.html and renamed it XF86_SVGA. This fixed the problem and I was even able to use my previous XF86Config file.
I'm seeing the same problem here with a system that has the SiS 5598 on board. Text appears as solid black boxes; some pixmaps appear as random garbage. Installing SuSE's XFCom_SiS fixed it for me, too. The XFCom_SiS readme states "This driver supports the SiS 6326, 530, 540, 620, 630 and 300 chipsets (and the older ones that are already supported in XFree86-3.3.5 as well, but with no changes whatsoever)." Did a patch applied sometime between 3.3.3.1 and 3.3.5 break this? I have the same problem with XFree86-SVGA-3.3.5-1.6.0 and XFree86-SVGA-3.3.5-0.6.0 RPMs.
Hmm, it looks like this is a bug in XFree86 code, not Red Hat's doing. I tried 3.3.5 under FreeBSD 3.3 on this same hardware, and the same thing happened. I filed a bug with the XFree86 project.
*** This bug has been marked as a duplicate of 6970 ***