During setup on a Digital Celebris FX-2, 200mmx processor, 64 MB of ram, s# Trio Virge DX/GX 2D 2mb video card. I destroyed Windows 2000 build 2129 Gold RTM and re partitioned the drive to FAT16, then installed Redhat's OS 6.1 and created Native Lunix partitions for the OS. During installation I have noticed terrable graphical displays of the GUI. When I completed the installation my graphical interface was totally unstable. The software did detected my S3 card and gave me the closest driver it had. Still the GUI has lines horizontal and when I use Netscape Navagator or move my mouse ( which has a white box with the curior pointer ) I loose clearness of the icons on the desktop. I will examine S3 web site to get any improved drivers. When I shrink my navagator and restore it it is clear until I move any graphics.
I have attempted to change the refresh rate, horizontal and vertical settings on the setup up gui and it did not help.
Is that system RH certified? What refresh rates and resolution are you running, on what kind of monitor?
try adding Option no_accel to your /etc/X11/XF86Config's device section.